Stateside, you've either got to import a DS Lite-sized rumble pak or suck it up and play with an older GBA-sized cart. I've always wanted some force feedback to help me improve my Elite Beat Agents (or so I hope, rather desperately...as Fruit Brute won't let me play Ouendan! until I'm good enough!), but I never wanted to deal with the annoying sticky-outtie-ness of an old cartridge.
But yay! The new third-party DS rumble pak from eWin that fits flush with my bite-sized handheld is now available for about $10, a full $14 less than the imported alternative - and from the review on GBA Temp, better-performing as well:
The rumble feature in the eWin rumble pak feels very different [from the official pak]; tested in the same situations in various games; the feedback felt more like what you'd expect compared to that given by the Nintendo pak. While still not silent; the noise that the eWin rumble produced was a lot quieter than the official pak.
Let's rumble! For a list of rumble-ready DS games, look here.
eWin Rumble Pak (Lite) [GBATemp.net]
[via DS Fanboy]