Its back up!! https://www.amazon.com/gp/product/B07GKHNBCT
psst the wireless adapter is $50 off today too https://www.amazon.com/Vive-Wireless-Adapter-PC/dp/B07GKHNBCT/ref=sr_1_3?keywords=htc+vive+wireless+adapter&qid=1563196732&s=gateway&sr=8-3
I pre ordered it yesterday just before I posted that
Just checked the listing and yes it looks out of stock now
https://www.amazon.com/Vive-Wireless-Adapter-PC/dp/B07GKHNBCT