I buy it from a local oil distributor. They deliver to my door and is reasonable. It would pay to check if there is a local oil distributor in your area.
I buy from Petroleum Service Co. also but my friend gets his from a local oil company for cheaper. I do not have the time to drive downtown for the better price. I will continue to order online.
Alan Blevins 1974 Cessna 150M N150V KFDW Hangar 9C