Letterboxed DVD available from Sinister Cinema
Sinister Cinema has CALTIKI available in its original, widescreen format (credits in Italian, dialogue still in English). This print also has the complete, often-edited Caltiki-eats-Max sequence, uncut -- in fact it's longer and more gruesome than I remember it, and now wonder whether I'd ever seen that entire scene unedited! Sound and picture quality are good. Price is $16.95 plus s&h, but they have frequent sales where you could get it for $10 or less.
SinCin may also still have the non-letterboxed version they first came out with over a year ago, which cuts the "details" of Max's demise, and if I recall the credits on that print are in English (perhaps this was the original US release?). So when ordering, be sure it's the widescreen version you buy.
Go to sinistercinema.com for information.