Mini SD Super Card: GameBoy Advance SD Card Reader!
As is often true I have some really good commenters on this video to point out that the majority of these are "clone" models. It's funny because I usually assume that they are clones -- Most of this stuff was made i the early 2000's. I really should have had that in the video. *sigh*. Coming soon: My 300+ game GBA Multicart. It should prove to be interesting.