Amazon also has a good deal for green can right now too, though their prices for that one seem to change constantly.
Gelatin is definitely pretty cheap for a good protein source. Peat food choices in general seem to be a lot more cost effective across the board, which is great. It's nice to see some nutritional guidelines that aren't so expensive for a change. So many of the nutritional guidelines I've looked over lately make it seem like you might be better off just cutting out the middle man and eating raw hundred dollar bill salads all day.