While nobody really enjoys thinking they paid too much for something, it often doesn't pay to scrimp and settle for something less just because the price is "right".
Magazines are at the very heart & soul of a semiauto pistol's normal & optimal feeding.
Yes, they can be considered disposable assemblies at some point, such as when they're damaged beyond being able to be repaired with parts replacement (like when the mag body itself is damaged), but getting the right ones, of good quality, is a worthwhile investment ... especially if you expect the pistol to feed & function when truly needed.