Please be careful about buying used VR headsets
There's a big thread on Reddit right now that has been almost entirely redacted and deleted now, where someone was scamming people into buying "used" VR headsets under the name icedventimocha, which is a handle commonly used elsewhere for a prominent member of the XDA community.
Getting a great deal on a used VR headset is awesome, but PLEASE make sure you do the research before you buy.
Here's a guide we assembled on safely buying used VR hardware, I hope it helps! Where to buy a used VR headset | VRHeads