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gamestop: Ask if you can try it
ebay: But they might rip you off
creigslist: Can go to their house to see if you like it
half.com: Great price on new and used ds lites
Collectables store: find your local colectables store and try and bye a great quality ds
Buy a broken one off of ebay and either fix it your self or there are websites that you can send it to and they will fix it for like 30 bucks. So it is like new
Plenty of places:
Department store sales
Online auction website (Ebay, Amazon, etc)
Pawn shop
Used game shops
Do any of your friends have a DS Lite? Maybe you could strike up a deal with them.