Xbox Live Setup Need Help?

I would like to get xbox live this summer. Can anyone tell me the best and cheapest way to get it. I have a wireless router but the adapter for the xbox is expensive. Is there a place were I can get 1 thT is cheap? Please link the website or tell me how to set up xbox live by using wires

Suggestion:

If you find it used it may be cheaper. Try eBay. If you want to use wires you can set your 360 up by a computer with wifi (laptop or desktop) and bridge the internet connection so you can connect the ethernet wire from your computer to your 360.

Heres the website for more instruction
http://www.youtube.com/watch?v=XBT-B-mfkBk&playnext_from=TL&videos=fF06BBlMeJU

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