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Here's the kit I run. You can find them a bit cheaper on ebay or elsewhere. Besides "boost Cooler" you can try "Mr Freeze." Here's a link to another company that I've heard good things about and has some relatively cheap kits to check out. There are a few other companies out there too, but I forget the names.
windshield washer fluid has a certain % of methanol in it you can squeeze out, beats $5+ from the track
+1. If you get that good winter windshield washer fluid, tehn you can just run that. Unfortunately not all states carry it, but most do. And it's a LOT cheaper to run windshield washer fluid than it is to pay to get actual methanol that you mix yourself.