kerosene/lard oil (bacon grease work well too) mixture is also a cheap alternative to wd40 for sawing aluminum.
out here in california you are lucky to find wd40 for less than $25 a gallon.
kerosene is about 11 bucks a gallon, lard to buy at the store is less than $3 proportionately.
the mixture saves about 10 bucks a gallon, and really adds up if you are doing a lot of sawing.
(bacon grease is a byproduct of breakfast so i don't really consider it as a cost, i use it a home and bring some to work)
i hope the info helps out