From a story posted on boingboing.net (LINK: http://www.boingboing.net/2010/02/10/old-nintendo-nes-sys.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+boingboing/iBag+%28Boing+Boing%29&utm_content=Bloglines)

     Up for auction is an original Nintendo NES gaming system with 1 hand control.  There are 5 games with it. They are, Family & Fitness Stadium Events in the original box with the dust jacket inside of the box, Major League Baseball in the original box with the dust jacket inside of the box, Teenage Mutant Ninja Turtles 2 the arcade game in the original box with the dust jacket inside of the box, Super Mario 3 in the original box with the dust jacket inside of the box and the original game, Super Mario Bros/Duck Hunt.  I have had this stored in the closet for years for my kids to play but the way that electronics come & go and change from one year to the next they wanted all of the new hot items of their own now and now it’s time to get rid of things that are no longer being used or wanted.  This system worked perfect when i stored it but somehow over the years, we have managed to misplace the AC cord & the television hook up.  I am listing this and selling without hook up but it I find them, I’ll send them along with the rest at no additional charges to you. Please keep in mind though that any ac cord will work with this and the hook up from a VCR would hook it up just as well as the original cords!

     It seems one of the games offered draw all the attention.  The game called Stadium Events (From Bandai) is a rare find for collectors of the rare.  The following explains why (Wiki: http://en.wikipedia.org/wiki/Stadium_Events)

Rarity

The North American, or NTSC, version of Stadium Events is universally accepted as the rarest licensed NES game available for purchase in North America.^[2][3][4][5] It was recently named #6 on a list of 20 "Holy Grails of Console Gaming"^[6], a list that covered all gaming systems in all countries. The reason for its rarity and subsequent high market price^[7][8][9] is due to its limited production and sales.^[10] At the time of its launch during the holiday season of 1987, Stadium Events was only available at Northern-region Woolworth’s Department Store, which was a test market for Bandai.^[11] In 1988, Nintendo purchased the North American rights to the FFF mat technology and re-released it as the Power Pad. The two Family Fun Fitness-branded games that had already been released, as well as Bandai’s version of the running pad accessory, were pulled from shelves and presumed destroyed. Because of this odd sequence of events, only 2000 copies are believed to have been produced, of which it is estimated that 200 copies reached consumers before being recalled.^[10] Today, collectors who follow the online sale of rare video games believe that fewer than 10 complete copies of the game exist, only one of which is factory sealed. An eBay auction of a NES console along with a copy of the game with manual and box landed the seller a winning bid of $13,105 on February 13, 2010.^[12]

So with that said look in your closets, storage units, and everywhere else that you keep your old stuff.  You may just be holding onto a lot of $$$$$$.

(The actual eBay listing Link: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370330327400)