Find a good place that sells the bagged chicken, I actually got a HUGE bag (cant remember exacts) at Costco, was the best deal ever.
Also, Sams Club has these canned chicken breast, 52g of protein per can. I usually throw it in a pan with some veggies and then mayo for a big giant protein stir-fry I guess..
Just go shopping, look at the prices, compare. Buy the cheapest, dont get the name-brand stuff.
Or option number B: Get a night job (what I did).. Just to fund my eating habits, funny eh.