I would do A search for the different fuel manufactures and find out if they have someone in your area that is distrubiting there fuel. Even if you had to ship 6 or 8 gallon cases it would be so much cheaper then going through Tower.
I have new to the hobby students buy through Tower because it's one stop shopping but there are cheaper and or better places to get your stuff. A web page for Power Master is www.powermasterfuels.com
I just got that from A RC Report Magazine sitting here in front of me. Do A search, it's worth the time. I used to drive almost two hours to get to A hobby shop, I would stock pile everything I needed then A two hour trip home. Some clubs sell fuel too. I would buy A case or split one with another pilot for the big savings.
Good luck!!