peptides sourcing

[psycho.]

i know that sourcing for peptides is kind of a touchy subject, since most people would like to keep their vendors disclosed so that it doesn't get found out. what are the most trusted sites for peptides and compounds? or if that is also another thing that can't be disclosed then what should i look for in a website? does third party testing even matter that much, because when it is, it's way more expensive. thx guys