Tower has it in both quarts and gallons. Other than that, most of your local hobby shops carry it.

Other fuels to consider, Morgan has Omega and Cool Power. The Omega is the one with Castor Oil. Byrons Originals is good.

Basically you want fuel with some Castor in the mix because if you have a lean mixture during a run, the synthetic oil will be boiling away and the only thing saving your engine will be the Castor oil.

The next time you visit someone that lives close to a hobby shop, stop in on the way. Also from Tower Hobbies web site, click on the Manufacturers site link. You may be able to order direct from them, but you may have to purchase several cases at once.

Go to your local field and ask around about how they get their fuel. Someone may have an extra gallon to sell, or may want to chip in to make an order.