A spare key from the recent Humble Bundle: "Virtual Realities: Mystery & Mayhem"
Key is for the Deluxe Edition, so it should come with some DLC. It does not appear to be region-locked, either. As always, you should only enter this giveaway if you agree to delete the giveaway if the key doesn't work, but this key should be fine since it's brand new.

I'll be doing a lot of my region-locked giveaways via whitelist, so join here: https://www.steamgifts.com/discussion/DsfB0/get-in-my-list-introduce-yourself

If you like these giveaways, I'd appreciate it if you followed the RoomScaleVR curator: https://store.steampowered.com/curator/29257834-Roomscale-VR/