360 Modding - 50 dollars

required items  (click image to view walmart online...prices may vary from store prices)

Xbox 360 - about 170 dollars refurbished at walmart. 

(with Power and Video Cables, remote not required)

Dual Layer DVD's - 50 pack - about 40 dollars (after shipping). (not required for modding, but for playing your backed up games)

Roughly 84 games...

So you don't have to backup all of your games on your own I have some that are already backed up.  I can give you a digital copy of what you already have on an external hard drive.  all you have to do is burn the copy to a dual layer dvd using imgburn.  at up to 4x burning speed.  (i suggest this as you don't usually have a problem playing the games at such a slow burning speed.)

What I do -

I will open your xbox 360 (this WILL void your warranty) and I install the custom firmware onto your dvd drive.  the latest Stealthed iExtreme firmware Available for whichever dvd drive you have.

After It's done flashing I test the console with a burnt game to ensure that you can play your backup's.

When it's done then I meet you the next day to return your working console to you.

Make sure you keep your xbox OFF the internet to ensure that you DON'T get banned.  You will be able to put your console online occasionally to get downloadable content and updates for games.  The Xbox can be updated via USB with ease from mocrosoft's website.