http://www.q-net.net.au/~nipngnwm/
http://maschinenkrieger.com/
These 2 sites should help.
I've been doing Ma.K kits for years now and have just posted my latest in this forum as my first post. I have 2 Krotes, so I wont put in an offer, but if you do sell I would think around $30-40. You can still buy them from HLJ when they have stock.
Personally I would build it, I'm finding that all the tips I've learned from the military guys works a treat on these kits.