Where to buy live feeders?

I need to try live feeders for a really picky ball python. I live in North Carolina, near the border of Virginia, where is a good place to buy live rodent feeders? I don't want to buy from the big corporations like PetSmart or PetCo (plus I think all their live rodents are meant to be pets, not feeders). Should I just buy some at the upcoming Repticon in Raleigh? Or does anyone know of good sources of live feeder rodents? I'm planning on just buying 1 or 2 to try out.

You might try your local Craigstlist or other ads. Also, check out any local reptile stores.