Avoid Cheaper Than Dirt...they often aren't cheaper and have some surprisingly anti 2A business practices.

For instance:
BREAKING: CheaperThanDirt Suspends ALL Firearm Sales - The Truth About Guns

Also, here's another example of some price gouging ($100 for plain aluminum AR mags?!):
http://www.gunssavelife.com/?p=4330

That AR class sounds fun! I've been interested in building my own but ended up with a couple of Colts instead.

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2006 X5 4.4i
Sport package, summer package, cold weather package, DSP + Nav
Bought 2/14 with 73k miles