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If you want to pay the minimum, then you can get second hand ones from Ebay, Amazon, Cex or Cash Converters.
There is a good comparison for a cheap Green DS here:
http://www.priceinvaders.co.uk/Compare-Prices/Nintendo-DS-Lite-Handheld-Console-Green
On Ebay, watch out for people posting DS consoles of one colour with a free “gift” of a different colour. Its easy to be mislead.
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ebay