you can use a r4 for ds lites but with dsi's there is a different type of r4 sorry i dont know the name of it
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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.
No, the R4 for the DS will not work on the DSi
Not natively, but you can get a flash card such as the R4 that will let you. Google R4 DS
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.
Volumerates.com is a great place to get DS Flash Carts like the R4. Volumerates is another site of Dealextreme, but cheaper. You don't need a special one for the ds lite, although I've heard there's a few being made for the DSi, which is in Japan now and comes out in NA later this year.