Fishing spiders. Semi-aquatic, large, and capable of running across water surface tension and diving to take small fish and tadpoles, which is genuinely worth seeing.
They need a setup no other animal here needs: substantial water surface, emergent structure to sit on, and enough humidity that they do not dry out. That is more work than a tarantula and it is the reason the genus stays niche.
Almost entirely wild-collected in North America and Europe, so availability is seasonal and specimens are typically adults with unknown remaining lifespan. Nobody breeds these commercially. If you want one, buy in season and expect a shorter run than you would get from a captive-bred animal.
The line on each tile: lowest ask per day.
Rarity BETA Rarity is supply, and only supply: the tier is how many sellers have ever carried a species, and for a single seller, how many separate listings. Price is not part of it, and neither is how recently it appeared. Tiers are given to tarantula species only.