Lowes, from 6/30 thru 7/6, has the 2-Pack 18.6 lb. (37.2 lb. total) for $ 9.88. Thats 26.5 cents per lb. It is limit 2 but normally you can buy 2 2-packs and repeat. Obviously, select "pick up at store" to save shipping.
If you missed Memorial day and can't wait for Labor day this might be the best deal on the Kingsford 2-packs. Remember, Wal-Mart bags contain less charcoal.
This should be nation wide but as always, YMMV.
Good Luck and Happy BBQ / Smoking!