The dwarf whip spiders: tiny amblypygids of caves and leaf litter worldwide, delivering the whole alien body plan, the sideways gait, the feeler legs, the raptorial arms, at thumbnail scale.
Keeping is the amblypygid program miniaturised: vertical bark, tight crevices, high humidity, springtail-and-pinhead prey, and height enough for the hanging moult. Several species tolerate communal housing. No venom, no risk, no drama.
Supply is thin and incidental, often arriving as stowaways in other imports, and captive breeding among specialists carries most of the trade. The genus sells the whip spider experience to keepers short on space, and the market is a handful of enthusiasts deep, priced on the scarcity of anyone bothering rather than of the animals.