Just curious what the average selling price for HK Mark 23 (10 & 12rd mags) and the USP 45 mags.  Thanks!!!

For full caps CDNN has them for $60, but you buy a full cap and they give you a neutered mag free, one for one, no limit.  Stand alone price for the neutered mags is about $20.
USP 45 mags run about $20 cheaper for full caps and has the same deal, one full cap gets you one free neutered mag, one for one, no limit.
They even have some used USP 45 mags for $30, full caps.  I do not know if the freebie applies to these or not.
link to CDNN