$10000 for a used Yamaha C3? um... I think it's quite impossible, unless you are lucky (and of course, the piano has to be in good condition.) If you are into the C-series, if I were you, I'd probably look more realistically into a used C2 or C1 with your budget. But, hey, I've gotten a C2 myself, it's great! A little tip to get the bargain you deserve: walk around school campuses, go to their music departments, ask your piano teacher, or whatever you can think of, but don't buy from dealers! They rip people off, so bad.