I was really really surprised to notice that Amazon UK sell the M3 and
R4 devices. As in, my eyes popped out of my head.
They're flashcards for the Nintendo DS that let you play homebrew, movie files, MP3s, and downloaded .nds roms! Just stick the files onto a micro-SD card, put it into the flashcard, and play.
They're very popular items, too. The M3 is ranked #16 in the NDS bestselling list, and the R4 is #43, at the moment.
I didn't think Amazon would dare to sell such things. Especially not directly with free shipping (which is what they offer for the M3).
I suppose Amazon could argue it's like selling MP3 players. You might play music from some download shop, or you could be playing illegal MP3s. Or maybe they just don't understand what the product does and why it's popular.
Meanwhile, today's news is that there's been a huge crackdown on US mod chip sellers! It seems customs were doing the raids, so maybe it's just for imported modchips; the ones developed within the US were ok? [shrug]