i want a nintedo ds whear can i find one chep?

Answer 1

There are basically four different choices you have:

1) eBay.
2) Your local gaming shop.
3) Pawn shops, flea markets, and discount outlets.
4) Yard Sales - perfect time of the year for this ;);)

Also - you can occasionally find a returned/slightly damaged version of the system at certain retaillers. A few little scratches can easily save you $20 - and the system will STILL work just fine ;);)

Answer 2

If you want one cheap, try eBay, or go to a used games store.
But if you want one new, you pretty much stuck at the $129.99 pricetag (unless there is a sale).