The cheapest i have seen was for £5.42/$9.50 (not including P&P or MicroSD Card)
There are too many r4 ds card in the market currently. The cheapest r4 ds card cost about 5EUR. But it only support DS and DS lite. The famous card is r4i sdhc 3ds. It support Nintendo 3DS,DSi,DS. So, I suggest you to buy a r4i sdhc 3ds card.
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Not natively, but you can get a flash card such as the R4 that will let you. Google R4 DS
An R4 is basically a mod chip for the Nintendo DS console. You can download games from the internet and put them on your R4 card and play the games on your Nintendo DS.
about 4000 games
no it is not that is a r4 card it for the Nintendo ds r4 card is not legal in most country. as it hurt the benefit of Nintendo and game developer. with the r4 card, user can play most DS games for totally free. they won't pay any money to game developer. So Nintendo is beating flashcard all the time.
Only if you buy a R4i DS.If you have DSi Firmaware 1.4 , you will need to make sure the box says "v1.4!" Original R4 DS card can't work on DSi. There are many r4 dsi card in the world. which can run on Nintendo DSiXL, DSiLL, DSi, DS and DS lite.