Popular preferred and trusted sources (MTF)

Hi, I´ve been 2 and a half years into mtf hrt, I´ve been on Sandrena which I spend $70 dollars per month aprox. I´m tired of spending so much into this, since I started studying and now I got more things to invest on and I recently discovered injections are actually very cheap.

I´ve been doing my research and I have seen that people tend to recommend Voix Celeste, Astro Vials, Open Gate Labs and Otokonoko Pharmacies the most, but I wanted to know specially if some of this sources are known for being owned by people with degrees on pharmacology or related. Also, just in general, what is the source you trust the most? and if there has been cases where someone has had a bad experience with those that you know of, like infection, scams, or sketchy lab tests, etc?? Please and thank you