S&W fuels
Wildcat fuels

Both of them are at about $15 for 5 cases or more of 15% nitro. S&W is 20% oil and doesn't charge for custom blends (all synthetic or whatever). If you get more than 30 cases you get an additional 5% off wholesale. They say it's about a hundred and ten bucks to ship 5 cases, and like a hundred and thirty bucks to ship 30 cases.

I think the best thing to do is get a drum. You have to get taps and portion it out promptly though, but I know pattern clubs do this and pay about ten bucks a gallon.