A single dwarf, K. brunnipes, out of Brazil, and about as small as tarantulas get while still being worth keeping.
Barely two inches, heavy webbing, semi-fossorial, and fast. The husbandry error people make is housing it in something appropriately sized for a tarantula rather than appropriately sized for this tarantula. Small enclosure, deep substrate, and it will build.
Affordable and consistently available on captive breeding, with prices flat for years. Dwarfs generally trade below what their attractiveness would justify because producing, shipping and feeding them costs little, and brunnipes is a clean example. Good value for a keeper who has run out of shelf space rather than interest.