Xbox Liquid Metal Sidekick Wired Controller
I thought this was kind of funny. I was browsing the daily Newegg emailer and I saw a PowerA Xbox Liquid Metal Sidekick Wired Controller - Xbox One/Xbox One S/Windows 10 (Black) for $15.00 with Promo Code: EMCRDCJ65 but I like to read the reviews before I decide if it is a good deal and there's only one review dated from today and under the "Cons" it states that it "works with raspberry pi (retro pie)".
That is funny. I guess he either meant that it doesn't work with RetroPie, or meant to list it under Pros. The review might have actually been written by a forum user named @PECONAUT. I don't know if he ever got his issue with the controller sorted out, but the "Liquid Metal" stuck out in my memory. It's a sharp looking controller and a good deal. It also might still be possible to get it working. You just never know with a 3rd party controller.