Great advice above!
Lots of non-poultry options: beef, pork, fish (we use sardines & mackerel), rabbit, venison, lamb, buffalo, goat, llama, emu (although that might be considered poultry...)
Our "base" diet is boneless beef, boneless pork shoulder, pork ribs and sardines (frozen/whole, from the Asian market); plus "toppers" of green tripe, beef kidney and lamb liver. The rest we add in as available for variety. I'm finding with our local buying group, the 'variety' is out-weighing our 'base' contents quite often.
There are also online vendors that will ship stuff: greentripe.com and hare-today.com are two that I think ship nationwide. plymouthpoultry.com is a PNW operation - that has much, much more than just poultry - maybe there's something similar in your area.
There's also a yahoo group dedicated to just finding suppliers:
http://groups.yahoo.com/neo/groups/CarnivoreFeed-Supplier/info
Someone here was just talking about raising 'feed rabbits'... I'm sure it could be done. I don't think I'd be able to do the slaughter piece of it... but there are traveling butchers that might help with that piece, too.