My beardie was found through our local zoo. Someone gave them info on one needing a home and they contacted me (we are both part of city departments). It worked out fairly well. In the future, I'd consider our local pet store a good option. She breeds her own beardies and I've met some of her adults. They are well cared for and she used to work at our zoo, so I know she's not going to try to sell me on getting two or feeding them mealworms.
My boy was in a first grade classroom for almost 2 years so he's very calm and acclimated to children, which is a plus for me. I'm a Children's Librarian and he's my education animal. I don't think the previous owner did everything right with him, but I'm educating myself on giving him the best life possible, so I have high hopes of spending years taking care of and loving him.