Cheapest wireless network solution?

I want to make my 360 connect to my home network wirelessly...I know the adaptor is 100 bucks, and i looked online and theres a way to to soemthing with some ddrt thing, but my router isnt supported, I was curious if theres any cheaper way. Thanks

buy an adapter off ebay for like $65 though there are plenty of other wireless adapters that work for the 360 just google it and you'll find them