I strongly second the Frozen Vegetables. Unless you have hours to wash and fresh veggies, frozen is much better.
I don't go to Costco, but I bet they have 5 lb bags of frozen veggies for $1 a pound.
regular ground beef 85%
canned tomatoes -- don't buy regular tomato sauce it's loaded with sugar
Eggs -- but unfortunately, industrial eggs are nearly worthless and the good ones are too expensive
No coke or pepsi, that stuff is expensive. Iced tea mix?
I think the real issue is going to be fat. Butter, coconut oil, olive oil are very expensive. Are there any cheap fats?
5'0" female, 43 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained to 110 on sugar cheat. Reset with 85P / 90C / 90F. Currently weaning off fat to 85P / 90C / 60F.
MY PRIMAL: I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I advocate a two-month strict adjustment for newbies. But everybody is different and other need to tweak Primal to their own needs.