I'm aware of NootraBioLabs, Hard Rhino (based in China apparently, which has concerned some people about the quality of their products), Cerebral Health, and SNS (who appears not to sell pira anymore). Is Hard Rhino's quality inferior? Thanks!
(I'd post links, but I just signed up for Longecity, so I'm not allowed to include links in my first 10 posts :-\.)