Adex or aromasin is best. I suggest keeping letrozole on hand incase you get any gyno but you shouldn't ever need it as long as you take the adex or aromasin. I'm not sure who sponsors this board so I don't wanna step on any toes, but if you do a google search you can find them pretty easy. Then once you've narrowed it down I suggest you search some reviews of the companies your considering. There are some great rc companies out there that offer them at a much better price then online pharmacies.