Its extremely easy to make it yourself. Just make sure you get a good measuring cup/beaker, they have them @ Scotcher for about $22 bucks or ebay has plenty of glassware. Also its $16 for a 20 liter methanol can w/ spout.
The oil is $55 a gallon, the nitro is $22 a liter and the methanol is $1 a liter. I plan on buying 4-5 liters of methanol and 1 liter of nitro each time I go. That way its always fresh and I don't have a ton of chemicals sitting in the house.
I figured its about $8.70 a liter, so cheaper and WAY higher quality than shop fuel. My next batch I'm going to try a 8% sythetic/8% castor mix instead of the 10%/5% I did my first time.
The adjustments I did made a huge difference at the track. My biggest problem is run-time with the smaller 125cc tank. Qualifiers will be no problem but to make a 10 minute main I'll have to top off the tank right before the start since it takes about 3 slow laps to get the engine over 210F.