Saw a preban Beta, new, not refurb offered on Sturmg. for $475 within the last 24 hours. It didn't last very long though.
You might keep the accessories board opened in a browser and refresh it every now and then. There are some sellers getting the jitters as their $600-$800 refurbed C-Mags get closer to the $200 mark when / if the ban sunsets.