You could always try Craig's List. Besides that there could be some music stores in your area that sell used stuff, and of course, you can always scour the pawn shops.
craigs list i've tried before...no dice.
i found one good thing at a pawn shop awhile ago. it wasn't really what i was looking for, but the for the price i should have just purchased it. i'm an idiot. now everytime i go to my local, they have a bunch of squire p's and that's it.
i've called around to a lot of the local shops around here. no one has what i want.
all i want is a late model black mia p with a maple neck. that or a natural with maple. i'm not being THAT picky.