Do you have a membership to Sam's or Costco? I go there and stock up on tuna (like 12 cans for $3 or something like that). I also get a ton of chicken breasts there and grill 'em up on my Foreman.
As for protein supps, Costco acutally has a 20lb bag of protein for pretty cheap (not sure of the exact price). Also, check out
www.ezpricematch.com They will take any price you find on a supplement they carry (they have a ton of stuff), and knock 5% off the price. It's a pretty sweet site. Good luck.