I ordered mine direct from Lubrication Engineers. They will sell you a case of 24 bottles, good for something like 3000 gallons. I think it was $5. 00 and change per bottle. plus shipping. No CA tax. Look at the LE website, and call their 1-800 number. I think I calculated the cost per gallon as being around $. 056 or so. If you cannot locate the number, email me direct and I will look it up on the receipt. Matt