Yard - Concrete Block 8x8x8
Angelus
http://www.lowes.com/ProductDisplay?partNumber=10336-44840-8034&langId=-1&storeId=10151&productId=3608976&catalogId=10051&cmRelshp=req&rel=nofollow&cId=PDIO1 $0.97. Then 5% on Lowes card ($0.92). Then 10% HomeDepot match ($0.83).
http://www.homedepot.com/p/Angelus-Block-8-in-x-8-in-x-8-in-Concrete-Block-088B0050100100/100318645 $0.97