Like most parents of young children, I love to warm their little hearts and glean those wonderful smiles and hugs all for getting that "must have" DVD, book or video game.  The thing is these things are so relatively expensive and soooo transitory.  Some kids want every single thing they see advertised on TV.  I have taken my kids to movies during which they have slept most of the time only to profess how much they want the movie when it comes out on DVD.  What's a parent to do?  Simple.  Provide a limited space in which these items are stored such as a DVD cabinet, video game box or book shelves.  When the space is full, no more.  You want more?  Give me some to sell on Ebay or Half-Bay.  I cannot tell you how well this has worked.  My kids have a generous sized video game cabinet which allows them to have 15 or so of each game system game -- XBox, PS2 and Game Cube.  Whenever they have their hearts set on a new game, I get 1 for each new one to sell.  Not only does this offset the cost of buying the new one (which I can also usually find on Ebay), but it keeps my kids' entertainment space from overflowing.  With books and movies in particular kids simply outgrow them.  I could build a small house if I had some mortar to hold together all of the  board books my children played with at 3 that are worthless to them at 8.  Sometimes they fall in love with a series such as Junie B Jones or A-Z Mysteries and have to have all of them.  These make great auction lots and clear out a lot of space!  The funny thing is that I have met a lot of nice parents on Ebay all in the same position.  In fact, I have even been able to "trade" lots of books, some video games and DVDs in a kind of community sharing.  Very nice on the wallet!  So whether it's for the betterment of continuing commerce (or just your feedback rating), keeping peace in your home or order in the kids section, make 'em put up some of those old games, movies or books for those must-haves of the future.