For those of you who aren't little Japanese girls, Love and Berry is a rhythm game that also dispenses cards featuring different outfits for the two title characters. The DS version makes use of the same cards that the arcade game spits out. While the series hasn't reached special-edition-DS-Lite popularity in the U.S., much less promotional-sewing-machine popularity, Love and Berry machines can be found in some American arcades, including Sega's own Gameworks. If you can't find the machine, and therefore can't find the cards, then we don't know what to tell you. Some might show up on eBay, or you may be able to find scanned cards. Or you may be able to enjoy the dancing game without new hairstyles!
$12.90 is pretty cheap for a card reader that some genius out there could appropriate for homebrew development. Let's hope someone who likes to work on homebrew DS apps is reading.
Sometimes, extras and add-ons can be great ... but sometimes, even nifty ideas (like 
