R4i-SDHC or the RTS have the best interface in my opinion. They carry R4i-SDHC, R4i 3DS, R4i RTS and others. All of them work on the current firmware version of DS/DSi/3DS.
There are a couple of places you can buy R4 for the Nintendo DS system. You can buy this at Best Buy or GameStop.
Nintendo ds and an r4
No they are illegal now go cry to your mommy
www.r4i-sdhc.com/is the best 1!
You can buy an R4 chip online at Ebay, Amazon or Kijiji OR at Pacific mall scarborough to find out directions go to www.pacificmalltoronto.com http://R4central.ca has the best prices on R4 and R4i cartridges with fast free shipping to all Canadian destinations
IF you mean R4 DS, then you have to buy it.. you cant just download it.
there are a lot of online sites to sell those r4 cards, just be careful of the R4 clone cards, there are many cards called R4 in the market, if you plan to buy a r4 card for your 3DS, i would recommend you buy r4i gold 3ds or supercard dstwo, both of them are working great on your 3ds.
wal-mart ,target,best buy,maybe game-stop,
You will have to buy R4i, because R4 doesn't work on DSi.
If you are looking to buy an R4 for your Nintendo DS, DS Lite or DSi, i have several recommendations. The MAGIX 300X R4 costs $10-$25 brand new, and it only has a 2GB interface, but its durability is outstanding and it is not a Helvi-Trax device, so there is no security blocks on it. But the Alsevan Torena
You can no longer get them on the larger websites like Amazon and eBay.
What!? A DS R4??? Well i presume you meen 'how do you make the DS have an auto boot R4?' (not possible!) Just buy an R4, theres no way you can have a DS what runs roms without an R4 (or any other flash cards) You can buy them here: http://www.r4i.co.uk/ (for both DS and DSi)