I saw a tutorial how to make a Linksys router a wireless adapter for your 360, but again you need a cable to connect the router to your xbox, plug in the router on a power suply and flash the router to put a different firmware on it so it acts like a wireless antena.
That's just not worth the effort and instead of a cable you'll have a wireless router in the back of your TV.
Other adapters I don't think they work. Mine was about 90$
It's pretty much the only way, sorry :/







