I bought a VP9 for $520 OTD and a VP9SK for $540 OTD in December. I was ready to drop my Glocks.
Regretted it (bought the VP9SK because it dropped in price before I picked up my VP9).
Ended up selling one for $450 and trading the other for a P365.
BUT, I made up my loss selling the $400 Of magazines I got from The rebates (5x 17rd & 4x 20rd for about $20 out of pocket).
I think a few versions are still new for $500, but without the rebate, there's more incentive to buy a used one.