I think from like $1200 - 1500 up. There has been an offer recently on another thread here. Ask mmizesko if you want it from trusted source.
But! Be very careful about the sets from ebay. They all claim to be complete and correct, but I, actually, have never seen a complete and correct one on ebay. I took the road of completing a set piece by piece. You would get there over time. More rare are e.g. wooden handle screwdriver or waterpump pliers (correct ones).