Not sure if there have been other charcoal sales, since the Walmart one that I took advantage of, but I ran across this one today.
Kingsford 13.9 lb. Original Charcoal Briquettes (2-Pack)
I am assuming this is two 13.9 lb. packages for $6.88 total, which would be a good deal. Ad in my email say prices valid through 7/4.