Newegg has the HTC Vive on sale right now, though it's not actually on sale as $599 is its regular price. But Newegg is throwing in a $100 gift card, which is like free money, especially if you shop at Newegg often.
The HTC Vive is heralded as the best virtual reality headset right now, and it is truly that great. It offers up a ton of different games and apps for you to use in the virtual world, and it's also pretty easy to get setup and using. There are over 500 games available through SteamVR, so you'll have plenty to play. Additionally, this comes with the controllers, making it easier to play games and such. This does not work with smartphones, but you will need a compatible PC, which Newegg has a ton of those available as well.
While it is after the holidays now, Newegg is still offering up some extended returns, if for some reason you don't like the Vive and want to return it. So you have longer than the standard 14 days, which is definitely good to see. There's no taxes being collected by Newegg, and there is free shipping. Although it is pretty slow shipping, and you can pay for faster shipping, as fast as next day.