Looking to own a copy of the game? There used to be a couple places you could buy Oni firsthand, however this is no longer the case. You can often find secondhand copies on Amazon, eBay, and similar sites. If anyone knows of other places Oni is sold in any quantity, let us know in the comments!
P.S.: The community modding framework known as the Anniversary Edition (see the "mods" tab) requires a full retail copy of Oni for Windows or Mac.