You can add oil to your coolpower to bring it up to 20%. Castor and synthetic can be shipped without a hazardous material charge. A gallon of castor is around $16 and a gallon of synthetic is around $24. Sig, S&W and probably many others will sell and ship gallons of oil.
Alternatively your LHS might be willing to order the fuel you want. It might take a long time to come in with their next regular truck delivery. Otherwise you would incur the hazardous material charge, which is high.
Blending your own is even better, but you will need a local supplier of methanol and nitro. Race tracks sometimes will sell methanol to modelers. I don't know where to get nitro.
Last edited by JPMacG; 12-21-2013 at 08:07 AM.