I just got a carbine that takes glock mags and I want to fuel it up with a couple new mags. I have a few ets mags and they work, but I tend to like mags with metal lips so I’m looking at factory mags or any others that have metal. The only other I’ve seen is SGM, but they don’t seem common, or cheaper than factory so may as well get factory. I’d need 9mm and somewhere in the 17-24 rd range would be best. Is 20$ as low as they go? Thx.