Does anyone know where to purchase a used k2500 or does anyone have one for sale?

I have seen a couple listed within the Harmony Central (.com) classifieds but even used, they are quite expensive. The K25s are worth every penny though.

pending on how much you are willing to pay you can probably get a new one for a little under 4000 at Sam Ash... "without the sampler"

Watch Guitar Center's sales as they regularly advertise the K2500XS (88key + sampling) for under 4K. I got mine for $3699, though I have not seen them at that price since. However, with an "out of state" mailorder house, you may not have to pay taxes. This varies from state to state but in the majority, it is a tax free sale.