most mini owners will advise you to skip aftermarket mags.
imo 2-3 mags that work perfectly is better than 10 mags that are "iffy."
idk why there isn't a solid, reliable aftermarket mag, but as far as i can tell...there just isn't.
i understand $ being tight. but no one should have to buy 5-6 mags at once. maybe purchase 1 mag per month until you get the amount you feel you need. in most cases, the price difference is only about $10.
but the price of factory mags never bothered me much...mostly cause i have never felt the need to have more than a few mags.