For a second, I thought the preview image of the Lexar player was the transmitter, and it is actually that tiny.. I was probably confusing it with Texar, a broadcasting audio company whose name you might see in you local station's radio room.
Chris Cuff is one cool dude, he's built those stereo transmitter kits for years on a small scale, seemingly just to get people on the air, and didn't charge high prices like other companies would. I was lucky to get one some years back as my first AM stereo kit and Chris helped me to set it up.
Crhis' design is based off of Alfredo's design that was done as a college thesis project, actually a version called the "Alfredo Lite", a simplified version of the full transmitter, with Chris' modifications to it.
Alas, I don't know if Chris is still making the transmitters, the site I used to see them on was off line, and I don't see them around now. AM stereo is still awesome!