Among the most common invertebrates available in the pet trade are the arthropods which include large spiders such as the tarantulas and wolf spiders, scorpions, and land hermit crabs. All are relatively inexpensive and readily available writes Douglas R. Mader, MS, DVM, DABVP (C/F, R/A), DECZM (herpetology). His article offers a primer for the most common invertebrates available in the legal pet trade.
Source: Veterinary Practice News, May 17, 2022. Link.