The only copy I found on ebay has 2 days left of bidding; the only copy I found on Google Products was for $400. As for a price that actually sells, I don't know- they get listed at over $100 routinely, but they aren't actually as valuable with the advent of DOSBox since the old DOS copies are so cheap.
The average selling price is more than it should be, at any rate.
I have an extra copy of just WC2 Deluxe if anyone around here is interested in purchasing it. I've got both KS and WC1/2 Deluxe now so I really don't need just the WC2 version. If anyone wants just PM me.