Just a rule of thumb, you probably won't get much. Pet stores will try to give you probably 25% of what you're asking. They will say they can get them this cheap wholesale and that. Instance. I had a western hognose I wanted to sell and I paid like $75 for them, I really wanted around $50, but I could only get like $20 from a pet store. As far as your leopard gecko goes, I was looking into getting one, what kind do you have? I'm looking to get a raptor, with the full red eyes. Your best bet to possibly get rid of your 2 snakes would be to probably put them on craigslist(as much as I hate to say it) and put a small adoption fee. Just PLEASE, PLEASE, PLEASE make sure they are going to a good home, ask the people lots of questions, if they don't get majority of them right, don't let them get the snake, you don't want any inexperienced people getting them i'm sure. They do have some knowledgeable people like me that look for snakes on craigslist, because sometimes people don't realize the value of what they are selling or so.