Upon hearing this good news about the AT&T Infuse 4G docks, I went into my local AT&T retail store and they had one car dock and two desktop docks left. They already had a reduced price sticker on them, and the guy said that he doubted that they would be reduced any further. When he rang them up (car dock first), the desktop dock indeed rang up as $.50! Both him and the guy next to him started to see if they did anything wrong, and I told them that this was the reason I was buying them. Its a well-hid secret. The guy next to him jokingly said "Ebay!"
Just to follow up on some of the comments, the car dock and the desktop dock both fit the E4GT, however you can see where it was designed for the more squared-off Infuse 4G. You can probably dremel the desktop dock if you dont like the space between the back of the phone and the top of the holder. And for the desktop dock, it does mention in the documentation that you can flip it on its side to show in landscape mode.
Now I need a better docking app than the built in one.