I remember my first post... It was an introduction with my stats and goals. Why don't you do that and participate and in no time at all you'll know about so many sources for an AI you'll have a hard time choosing.
Sarmsx has potent stuff. You should give them a try. My friend gets gyno from looking at steroids and the aromasin from Sarmsx is keeping him protected.
Www.sarmsx.com has very high quality aromatose inhibitors in liquid form that I personally use myself. I've been very pleased with them to control estrogen. It's top notch and as good as you'll find anywhere
(PM me for a price list for Biotech Labs and 10% discount)