I do not usually find many additives on sale. So I like to post things that I have found to help people out. Stanadyne now has a contract with Autozone and Autozone has 20% off coupons you can use at the store. Not all stores carry it. http://stanadyneadditives.com/ Diesel Fuel lube has a group buy on Gallons shipping is $4.95 for as many gallons of the same product that you want. http://dieselfuellube.com/order2.html Then they made a sale page to combine some items I guess. http://dieselfuellube.com/sale.html Post up what you find.