A gallon bottle of my LHS "concoction" is $15. However, this is somewhere around 5% and I like to use 15-30% in my various motors; depending on season, motor type and motor size. If I remember correctly (all written on the planes and in the transmitter data), I run
20% Cool Power on my Thunder Tiger Pro while I use only 15% on my O.S Dual-Stroke. But, I could be mixing those up. At any given time I have about five gallons of various nitro in use/storage.
I believe the last time we picked up a bottle it was $25 for a gallon of Cool Power at the LHS. But, they're having nitro fuel sales monthly, so it's probably more around $30 when not on sale.