[quote name='Treythalomew']I can second the OG xbox adapter. I used one with my original xbox and continued to use it into the 360 era without any problems ever. Besides that I've seen them on ebay recently selling used for around 40-50ish. Considering how simple they are, it'd be hard to get one that is broken or anything.[/QUOTE]
I'll third this. I used one on my 360 from day 1 until I got a HD-DVR receiver and switched it over to the receiver and bought a 360 one for the 360. In my experience, the original worked far better than the 360 does. Especially if you have a HD-DVD drive, I would strongly advise the original adapter, or another semi-wired solution, then the 360 one. You have to connect manually almost every time and the speeds seem slower, not to mention that I routinely, for some reason, get locked out of my own network with it, which I have never once had that problem with either the PS3 or the Wii, or hell, the PSP for that matter.