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Monocentropus balfouri

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Socotra Island Blue Baboon
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🌍Old World 🕳️Fossorial ▪️Medium 🟡Skittish ⚠️Intermediate 🏜️Arid

An Old World burrowing tarantula. Medium-sized, skittish and fast, and generally recommended for intermediate keepers. Market price is $70, with 30 live listings across 18 sellers and a lowest ask of $40.

Blue-grey legs, tan carapace, and genuine communal tolerance, which is the actual reason to keep this species rather than the color.

Siblings raised together will share an enclosure without the eventual cannibalism that ends most communal attempts, and there are credible reports of prey sharing. That behavior is unusual enough to be the main event.

Lowest Ask
$40
best value listed now
Market Price
$70
trimmed median, recent asks
All-Time Low
$29
seen across all crawls
90-Day Range
$29–$375
low to high
Live Listings
30
at 18 vendors now
Rarity
Ubiquitous
1/10 · seen at 24 vendors ever
Prices as of the last crawl — 8 hours ago ()
The white marker shows where today's best-value listing sits between the lowest and highest price ever recorded. Liquidity: 2303 listings / 90d · 24 vendors ever
$29 all-time low best value now: $40 $375 all-time high
Price History — asking prices; a time trend appears as daily crawls accumulate
Each dot = one listing: Female Male Unsexed | – – all-time low – – market price best value now (hover the chart for price · size · sex · vendor · date) (drag across the chart to read any day)
Available Now — 39 listings · click a row to open the seller's page
9 of these are from sellers we exclude from price stats (they list premium display specimens), so the figures above are calculated without them. How we calculate prices
Josh's Frogs 👍
$40 $80 landed
1/2 inch U CB View listing
Buddha Bugs 💎
$40 ❓ shipping
The Defiant Forest 💎
$40 ❓ shipping
The Defiant Forest 💎
$45 ❓ shipping
Hardcore Arachnids 👍
$45 $95 landed
Exotics Unlimited USA 👍
$49 $88 landed
0.5-0.75" U CB View listing
Exotics Unlimited USA 👍
$49 $88 landed
0.5-0.75" U CB View listing
V Exotic 👍
$50 $100 landed
Shane's Spiders 👍
$50 $100 landed
One Love Tarantulas 👍
$55 ❓ shipping
FangzTV 👍
$55 $104 landed
TyDye Exotics 👍
$56 ❓ shipping
1.0-1.5" U CB View listing
Pacific Northwest Arachnids 👍
$60 ❓ shipping
Fear Not Tarantulas 👍
$65 $94 landed
Spider Shoppe 👍
$68 ❓ shipping
3.0-3.5" CB View listing
Big Z's
$70 ❓ shipping
Underdark Inverts 👍
$75 ❓ shipping
Urban Tarantulas
$75 $125 landed
1x Solitary - taking down medium to large crickets U CB View listing
V Exotic
$80 $130 landed
Juvenile U CB View listing
Pacific Northwest Arachnids
$125 ❓ shipping
Underdark Inverts 👍
$150 ❓ shipping
3" ♀ CB View listing
Buddha Bugs
$175 ❓ shipping
Plumb's Exotics 👍
$200 $260 landed
Adult Female 5"+ View listing
The Mother of Spiders
$200 ❓ shipping
V Exotic
$200 $250 landed
Shane's Spiders
$200 $250 landed
Adult CB View listing
Shane's Spiders
$225 $275 landed
The Spider Room
$250 $310 landed
3.5"-4" CB View listing
Pacific Northwest Arachnids
$265 ❓ shipping
5.0" CB View listing
The Spider Room 👍
$300 $360 landed
V Exotic
$320 $370 landed
Juvenile U CB View listing
Urban Tarantulas
$375 $425 landed
Female - adult - 4 yrs old CB View listing
Urban Tarantulas
$450 $500 landed
Female Paired/Mated Gravid - 5 years old View listing
Westside Tarantulas 👍
$475 ❓ shipping
Sub-adult CB View listing
Urban Tarantulas
$475 $525 landed
6x Communal - taking down medium-large crickets ? View listing
Westside Tarantulas
$650 ❓ shipping
Adult CB View listing
Urban Tarantulas
$900 $950 landed
13x Communal - taking down medium-large crickets ? View listing
Westside Tarantulas
$1500 ❓ shipping
Westside Tarantulas
$1950 ❓ shipping
SellerSizeSexSourceAskShippingLandedDealRarity
Josh's Frogs 1/2 inch U CB $39.99 -19% $40 $80 👍 1/10 Buy →
Buddha Bugs 0.75" U CB° $40.00 -33% 💎 1/10 Buy →
The Defiant Forest 1.25" U CB° $40.00 -33% 💎 1/10 Buy →
The Defiant Forest 1.25" U CB° $45.00 -25% 💎 1/10 Buy →
Hardcore Arachnids 1/2" U CB° $45.00 $50 $95 👍 1/10 Buy →
Exotics Unlimited USA 0.5-0.75" U CB° $49.00 $39 $88 👍 1/10 Buy →
Exotics Unlimited USA 0.5-0.75" U CB° $49.00 $39 $88 👍 1/10 Buy →
V Exotic Sling U CB° $50.00 $50 $100 👍 1/10 Buy →
Shane's Spiders Sling U CB° $50.00 $50 $100 👍 1/10 Buy →
One Love Tarantulas 1.5" U CB° $55.00 👍 1/10 Buy →
FangzTV 1.5" U CB° $55.00 $49 $104 👍 1/10 Buy →
TyDye Exotics 1.0-1.5" U CB° $56.49 👍 1/10 Buy →
Pacific Northwest Arachnids 1.5" U CB $60.00 👍 1/10 Buy →
Fear Not Tarantulas 1.25" U CB° $65.00 $29 $94 👍 1/10 Buy →
Spider Shoppe 3.0-3.5" CB° $68.00 👍 1/10 Buy →
Big Z's 1.0" U CB° $69.99 +17% 👎 1/10 Buy →
Underdark Inverts 2.75" U CB° $75.00 👍 1/10 Buy →
Urban Tarantulas 1x Solitary - taking down medium to large crickets U CB° $75.00 +25% $50 $125 👎 1/10 Buy →
V Exotic Juvenile U CB° $80.00 +33% $50 $130 👎 1/10 Buy →
Pacific Northwest Arachnids 4.0" ? CB $125.00 👎 1/10 Buy →
Underdark Inverts 3" ♀ CB° $150.00 👍 1/10 Buy →
Buddha Bugs 0.75" U CB° $175.00 +192% 👎 1/10 Buy →
Plumb's Exotics Adult Female 5"+ ? $200.00 -14% $60 $260 👍 1/10 Buy →
The Mother of Spiders 0.5" U CB° $200.00 +304% 👎 1/10 Buy →
V Exotic Sling U CB° $200.00 +304% $50 $250 👎 1/10 Buy →
Shane's Spiders Adult CB° $200.00 +20% $50 $250 👎 1/10 Buy →
Shane's Spiders Sling U CB° $225.00 +355% $50 $275 👎 1/10 Buy →
The Spider Room 3.5"-4" CB° $250.00 +51% $60 $310 👎 1/10 Buy →
Pacific Northwest Arachnids 5.0" CB $265.00 +14% 👎 1/10 Buy →
The Spider Room ? CB° $300.00 $60 $360 👍 1/10 Buy →
V Exotic Juvenile U CB° $320.00 +433% $50 $370 👎 1/10 Buy →
Urban Tarantulas Female - adult - 4 yrs old CB° $375.00 +126% $50 $425 👎 1/10 Buy →
Urban Tarantulas Female Paired/Mated Gravid - 5 years old ? $450.00 $50 $500 👎 1/10 Buy →
Westside Tarantulas Sub-adult CB° $475.00 👍 1/10 Buy →
Urban Tarantulas 6x Communal - taking down medium-large crickets ? ? $475.00 +138% $50 $525 👎 1/10 Buy →
Westside Tarantulas Adult CB° $650.00 +292% 👎 1/10 Buy →
Urban Tarantulas 13x Communal - taking down medium-large crickets ? ? $900.00 +350% $50 $950 👎 1/10 Buy →
Westside Tarantulas ? ? $1500.00 👎 1/10 Buy →
Westside Tarantulas ? ? $1950.00 👎 1/10 Buy →
How these numbers are worked out — market price, deal grades, and what they do not mean

Market price is a trimmed median of recent asks for a species — the highest and lowest are dropped before the middle is taken, so one unusual listing cannot move it. Below four asks there is nothing safe to trim, so it is a plain median.

A deal grade compares like with like. A listing is scored against others of the same species, same sex group and same size bucket — never against the species as a whole. A 1" unsexed sling and a 5" confirmed female are different markets, and blending them is how a fair price starts looking like a bargain.

Graded against history, not against today's shelf. The comparison is every ask ever recorded for that group, counted once per listing rather than once per day it sat unsold. Grading against whatever happens to be in stock right now would let a single low-priced arrival drag the median down and re-grade every other seller — a race to the bottom, which is not something a price tracker should cause. Where there is not yet enough history, the live listings are used and the page says so.

The badges:

  • 💎💎 at least 40% below that comparable median — or 20% below and also an all-time low.
  • 💎 20–40% below.
  • 👍 within about 10% of it.
  • 👎 more than 10% above.

Those thresholds are deliberately wide. The same animal at the same size routinely spans about 2× between the lowest and highest seller, so "20% below average" describes an ordinary listing rather than a find.

What these numbers are not. FangTrack sees asks, never sales — nothing here is a record of what anything sold for. A small number of sellers who specialise in premium display specimens are excluded from the calculated figures because their asks are not representative; their listings still appear. Private collection uploads never affect any public number. Shipping estimates are the vendor's stated flat rate added to the ask, not a checkout total.

A grade is information, not advice. Condition, provenance and how well a seller packs a live animal are worth more than a few dollars, and none of them are in the price. More on how this is calculated →