That’s a fantastic deal. I wish I could find a deal like that with the traditional aluminum bags.**ONE DAY ONLY**
Buy 10+ and get free shipping. Use code PMAG and they're $7.50 each. Gen 2 PMags, no window. Pretty good deal if you need mags.
https://palmettostatearmory.com/magpul-pmag-30-5-56x45-magazine-mag571-blk.html