https://www.humblebundle.com/store/promo/vr-sale
Steam has plenty of sales, and VR gets a lot of love and solid discounts during those sales, but some of the biggest titles don't get discounted at all.
For the next two days, almost every big VR title of 2017 is on sale, some up to 50% off. I've been waiting to grab the more expensive AAA titles like Star Trek: Bridge Crew, Fallout 4 VR, and Rick and Morty: Virtual Rickality, but decided not to miss this sale.
Other top titles I'd recommend are:
Arizona Sunshine - 40% off
Fruit Ninja VR - 40% off
Call of the Starseed Ep 1 and 2, 60% off and 20% off respectively.
Raw Data tends to be a must have shooter as well, but at only 20% off it's still one of the most expensive titles out there.
These work for Vive and Rift.
Cheers!