Fauna classifieds usually has a lot of various critters for sale. There is even a trader rating for each poster that you can see on each sellers profile page, although not a conclusive way to judge reputation because some people don't leave feedback either positive or negative after a purchase. There's also a subforum called the BOI on Fauna where you can inquire about a seller's reputation. Always do a little bit of checking + asking questions before purchasing over the internet.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!