I got mine a while back, probably almost a year now, here at the EVGA Marketplace from a guy named Joey (not joeylasketti, joeyw something). I got it for $100. I am pretty sure it fits 775 ,1156, and 1366, as it has long holes where they mount, and the 775 is closest in.
A suggestion for a cheapish DICE/ln2 pot would be:
http://www.koolance.com/water-cooling/product_info.php?product_id=972 IMO though, go over to XS and message Duniek or some other pot maker and get a nice budget pot from one of them. Some pot makers: Duniek, piotres, Otternase, and of course K|ngp|n (i dont think KP does custom pots though...could be wrong). Also some other places: Dimastech.it/en and ln2cooling.com.