UPDATE from slickdeals
Update:
Acme hardware stores has a coupon book [forthemommas.com], as well as jewelosco (thanks goingcrzy), Market Basket and Shaws (thanks purplefdu) with $1/1 Kingsford charcoal. The coupons seem to be mfg coupons so ithey should be valid anywhere. Also see military commissary deal during their case sale event on Royal Oak below (YMMV), I put the details of my local event below. Menards deal added (thanks brokencycle). Finally, heard that Home Depot is waiting until Saturday of Memorial Day to put their charcoal on sale. I don't know about Lowes but I went there yesterday and they had 7 pallets of Kingsford in the store so they are getting ready for a big sale too. Academy deal added, thanks to Scott P.
Walmart's ad starting 5/22/2011 shows that you can get a 2 pack of 16.6 lbs of Kingsford charcoal for $7.50 (last week's sale price was $7.48 for one bag). This should be the beginning of a week and a half of charcoal wars between Lowes, Home Depot and Walmart. In preparation for last year's Memorial Day, Home Depot had a 40lb deal for about $11, I believe anyway, and Lowes came in a few days later with a buy one get one free deal that turned out to be a slightly better deal. I've attached an image of the Walmart page below for PM users.
Charcoal Briquets
Walmart - 22.6 cents per pound
Lowes - No sale price yet (expecting a 2 for one deal, currently $8.68 for 16.6 pounds) <- Maybe PM +10% to Walmart price as the packaging/weight is the same
HD - No sale price yet, currently 40lbs for $15.87 (expecting a 40lbs for $10.50 or 26 cents a pound deal but 5/19 ad doesn't list any charcoal deals)
Costco Bay Area - 52.8 cents per pound --- Kingsford Competition Briquets 2 - 18 LB Bags $18.99 --- thanks meetyburger
Military
Commissary Case Event [commissaries.com](YMMV, some end 5/22/2011) - Royal Oak 16.6 lb bag for $3.55 after instant savings (no tax but a 2% surcharge)
Academy Sports and Outdoor [shoplocal.com]- BOGO 16.6 lb bags for $7.99 - 24.2 cents per pound (thanks Scott P)
Menards - Royal Oak 18 lb bag, 2/$9 or 0.25 per pound -- they have an 11% price match policy but Royal Oak in 18 lb bags are hard to find, especially at a better deal
Charcoal Lumps
Walmart - No sale price yet
Lowes - No sale price yet (currently Cowboy 8.8lbs $6.97)
HD - No sale price yet
Costco Bay Area - no sale price yet
Current best price strategy
1. Buy Lowes.com gift card from the plastic jungle place for a 7% (face value < $200). - 9% (face value >= $200) discount off of face value. Note that they take about 5 days to get the card to you.
2. Get the $1/1 coupon from Acme.
3. Take the WalMart ad to Lowes for a price match + 10%.
4. Cost breakdown:
a. $7.50 for 2 16.6 lb bags.
b. Minus 0.75 for Lowes price match = $6.75.
c. Minus 1.00 for Acme coupon = $5.75. If you are really lucky you may be able to use 2 coupons (one for each bag).
d. Pay with card you got in step 1 with a 7% discount = Final price $5.35 + tax for 33.2 lbs of charcoal.