With the current market situation, this is a pretty good deal.
Sold out : /
If i wasn't sold out I would buy it ASAP
It was in stock at the time of me posting this, but good luck getting it.
Normally I wouldn't get one and I really don't need it but R9 390's are going for like nearly $400 used so it would be about a free upgrade.
Btw, if you do get one, you should upgrade to 1440p :P (I saw your (nice) pc build and noticed you have a 1080p 60hz monitor)