Don't ask me if I have done this before because the reason I am posting this is because I have and was turning a decent profit for a while when I kept this going... anyways here is the method. Go to your local Craigslist and search for Xbox 360's (Newer or Older) and find the ones with the 4GB hard drive... I always looked for the ones that where in the price range of $75-125 and on odd occasion up to $150 if it has some newer games with it. Next you will want to do the purchase after making sure the system works correctly etc. and then bring it home. Go to eBay and find a good deal on a new hard drive for the Xbox 360 such as the 250GB or 320GB hard drive. These should range you somewhere from $55-80 depending on which one you get for example on eBay right now the 320GB ones are going for as low as $55 and the 250GB as low as $30. Now you will want to purchase the hard drive and while you wait search for some tutorials on YT on how to replace the hard drive in your Xbox 360, there are several of them on there and it isn't very complicated. Anyways now you have installed your hard drive and have about $110-200 invested into this Xbox with a 250-320GB hard drive... Last of all you are going to want to relist this Xbox on Craigslist with the new hard drive installed and these sell for $270-300+ depending on if it has games or things included so that is part of the game is to find Xbox's with newer games and controllers included so you can sell for a higher price. Once you have done this once or twice you will know the demand on the product and can purchase 3-4 Xbox's at a time and do this with them and make an easy $70+ per sale. BTW: Once this thread hits 100 views and no posts I am removing the thread due to lurkers.