Mg-Mg, adex, and letro are hundreds of times more potent as AI's. Proviron has added benefits as well, libido increases, lowering SHBG, hardening up the physique, which make it apealling to many users. But if you are using more than 500-750mg test per week or are prone to gyno/aromatization then IMO the stonger AI's (letro, adex, aromasin) are the only choice. As for price... the first few times I bought and used adex, it was from mexico in brand name form and it was VERY expensive (about what you listed). However, with research company prices, it is now cheaper than proviron. If you can't get the research companies to send to your country, there is always the option of having a powder supplier ship a small amount out to you. 1 gram will be about what you pay now for 30 pills and it will last you forever.