1. SanDisk Ultra MicroSD 64GB ($14.99; regularly around $20)
several Micro SD cards on sale for Prime Day. One of them is the SanDisk Ultra 64GB, which I've used in my Samsung Gear 360.
There are several on sale for Prime Day. Most of them seem to use triple-layer cell (TLC) commonly found in budget SSD drives. However, the SanDisk SSD Plus is an SSD with multi-layer cell (MLC), which is generally faster and longer-lasting than TLC.
3. ViewMaster VR Starter Pack ($12.59; regularly around $16.70)
4. Samsung Gear VR with Level U Pro ($129.99; regularly $151.07)
Samsung Gear VR (reviewed here) and the Samsung Level U Pro headphones with microphones. TBH the Gear VR is easily available on eBay for much less, so this would only make sense if you wanted the Level U Pro headphones.
5. 3DR Solo Quadcopter with gimbal ($599; regularly around $800)
Kodak SP360 4k Aerial Pack to provide aerial 360 videos without the drone in the shot! Note: this order will ship in 1 to 2 months.
If you spot any other good Prime Day deals for VR / 360, please share it in the comments!