You can still buy the HTC U11 for $599 ($50 off the regular price)
To get the U11 for $599, you have to visit HTC's official US website (see the source link below) and use the promo code AMAZINGU11 at checkout. Apparently, this code is valid until July 1, so there are almost three full days left for you to use it. The code can be applied on the purchase of any HTC U11 color variant, including the brand new red one. However, it looks like the Sprint version isn't included in the offer, as it's currently out of stock.
With a very shiny finish and a touch-sensitive Edge Sense frame, the U11 certainly represents a change compared to HTC's flagship smartphones of years past. You can find out more about the handset by reading out HTC U11 review.
source: HTC USA via Slickdeals