That is a really great price...if the majority of my .223/5.56 guns weren't banned, I would spring for this deal.
Just as an aside I was on GP, and some guy has the audacity to charge .70 cents per round for some grossly oxidized and corroded .223 rounds. Forget the fact that they are second hand, old, and clearly have had some water/moisture damage...just looking at the boxes it is clear those rounds aren't worth 7 cents a round, much less 70 cents. You can get brand new rounds from Tenda for cheaper. Why some people sell garbage, I don't understand.
Also have noticed 9mm going down in price lately as well, even on the secondary market. Another guy was selling PMC 9mm on GP for what amounted to $14.30 a box. I seriously wonder how much of this is due to PCC market drying up and no new handguns being bought/sold. Only so much 9mm one can sell to feed the Homesteader...
It MAY be prudent to consider stocking up now, with the (hopefully) inevitable reversal of OIC 2020 and 2024 guns and (hopeful) reversal of handgun freeze. Ammo prices will go through the roof once the banned guns are made available again.