Primoteston from Mexico is a good product.. Like IG said, it's manufactured by Schering so you know it's going to be properly dosed and sterile.
I also think Aratest2500 is good, but some people complained that they weren't getting good results from the new batches (individually boxed, black plastic tops). I don't see many complaints now, so maybe there was a bad batch or maybe it was just another case of "board hysteria" (where one person says something sucks and then 40 people who've never used it agree). The Shadow recently tested Ara2500 and it turned out to be legit (contained around 240mg/mL with both the prop & enanthate esters).. Some people do say the vials are underfilled though, but for the price (in Mex around $15) it can't be beat IMO.