there are a lot of mags which will function in a CZ-75 style pistol (I'm only focusing on 9mm, that's all I have experience with)
a) Tanfoglio factory mags
b) Baby Eagle factory mags
c) factory CZ mags
d) Promags (aftermarket)
e) K-Mags (aftermarket)
f) Meggar (I guess, from above post, no experience with them myself)
All these mags differ in price, quality, availability, etc...
The selection is pretty big... I'd really recommend Tanfoglio mags, but they started cutting them almost in half as part of pinning them to 10, so they are very not-durable, so I'd recommend you stay away from those.