I used to keep madagascan hissing cockroaches. They are exotic, but cockroaches nevertheless. I'm considering getting some more soon. You can actually tame them and each has a different character! I've kept many exotic and less exotic invertebrates apart from cockroaches. Crickets were in the largest numbers. I've had dozens! My first cricket was wild-caught, but the rest were asian crickets taken from a pet shop(they are sold as food). They were popular among Chinese empresses, as bringers of luck and great sleeplessness medication(they "sing" really pleasantly). They kept them in bamboo cages. I kept them in terrariums and sometimes fed them some of that jelly! Even here, in my run-down country, Bulgaria, you can find exotic animals shop that has a variety of exotic invertebrate pets among their selection. They don't have such gigantic species of beetles, though. Mostly stick insects, mantids and their family, scorpions, cockroaches, spiders and the occasional giant millipede.