AR\47 mags are all but bought up online or otherwise.
stripped AR lowers are going for $300+ on gunbroker right now. Wish I had a few to sell.
Still a bunch of 30 round AR mags (GI style aluminum with light green follower) at my local shop today, $10 each. The place was packed though. I bought 2000 rounds of .308 and 8 Glock mags.
I have an Aero Precision lower assembled with FDE Magpul furniture (ACS-L). I could probably make some extra cash.