You can sell them. The cheapest ones I found a while back was European aquatics. I had tried my luck with petco ones but they both died. I then bought 4 since they were half the price of other stores, and they all survived. I split them up into two tanks after bonding. You just have to call around. You can try the petco ones as well if no one has them. Best bet is to get the small ones, adults are easier to sex but they may only like 2-5 years, and if you get one that’s bigger may not live much longer.