Got these on eBay (from the UK):
Maximo vs. Army of Zin - £ 4.89 + shipping
The Mark Of Kri - £ 3.79 + shipping
Primal - £ 2.39 + shipping
Bad news: Primal doesn't work.
The very bad condition of the game is to blame (it is heavily scratched). I've contacted the seller today and am still awaiting a reply.
Not that it really bothers me though. I wanted Maximo vs. Army of Zin more than anything, and just bought the other 2 games too, because they looked like a good deal.