http://www.modchipfactory.com/r4isdhc-rts-3ds-flashcart-for-3ds-xl-3ds-dsi-dslite-p-8.html ,this is the best r4 card i used,with top game compatibility and cheaper price.
I like that games can be fixed after the fact, hate that it's being abused via beta tests... And DLC... I was a 7800 owner back in the day and loved Impossible Mission, turns out I couldn't beat it because it was actually impossible lol