Dell Visor, Dell's version of Microsoft's "Mixed Reality" headset with controllers is on sale at Best Buy. It's normally $450 but it's $400 right now. Best Buy is also selling it through their ebay portal. Ebay has 8% ebay bucks for those that qualify. That makes the final price $368.
First let me say if your IPD is not darn close to 63mm, don't get a fixed IPD headset. You'll bum. You need to pony up and get a adjustable IPD headset. The Dell is fixed.
Right now, there's not much to do with this headset. Well... unless you signed up to beta test SteamVR. You guys all did right? SteamVR for Mixed Reality is in beta and seems to work. Also, Revive works and you can play Oculus games on a Mixed Reality headset.
Of course you can also buy it off the Best Buy website if you don't have 8% ebucks.
Here's a review.