Nintendo DS

My 7 year old daughter Becca would really like a Nintendo DS for Christmas. I have been looking all over the Internet for the best bargain I can find. I did some looking on Ebay tonight and think that might be the option I may go with. I know the products are used but with some of the offers, games are included for the price of buying a new one. I am really not to familiar with Ebay but I am going to keep my eye out to see if I can get a deal with one of the auctions.