GMT pretty much summed it up.
Only steel ones I find are used, rusted, and are $20+. Or the crappy korean ones.
I bought this magpul one to compare it to the tapcos I have. If you look in the gear part of the classifieds, you will see that I am now selling my tapcos to replace them with magpuls.
I am going to wait awhile though. Magpul is supposed to come out with a steel reinforced version of this mag.
This is what I am waiting on.