Amazon has the 24-Pack 5oz Bumble Bee Chunk Light Tuna In Water on sale for $23 - 35% off coupon (check "Save an extra" box, eligible on first S&S order for this product) = $15 with free shipping on $35+ or with Prime (extra 10% off for 5+ S%S orders). 22g of protein per serving. About 63 cents per can. 

• The 10-pack is also on sale, dropping to 60 cents each after coupon, S&S.