Time proven number one retailer for R4DS R4i DSi and R4 Gold 3DS Flash Cards.
All major brands like SuperCard DSTWO, AceKard 2i, CycloDS iEvolution and EZ-Flash Vi are available alonge with the R4 SDHC, RTS and other Nintendo DS, DSi and 3DS Flash Cards.
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R4 3DS Shop.com
R4 3DS for N3DS and R4i Card for both DSi and Nintendo 3DS. Don't forget to compare the features of the R4 3DS Cards <- compare before you decide which one to buy!