An ad on IGN's website lol.
Lol jk, but I first heard for flashcarts about the time GBA was still around, so maybe 4 years ago, when they were still like 120$ or something. I was just looking for some cheap alternative to buying games, knew about roms and emulators since '97? Main reason I got one for the DS though is because I bought Lunar Dragon Song used, and it was horrible, and I didn't want to go through and buy crappy games again. I still go and buy games I really like right now, but it's really niffty being able to try a game before you buy it. If Nintendo probably had demos for literally every game to come out, then I probably would have never even bothered buying a flashcart. Maybe I would so I didnt carry around like 30 games, but it was the demo thing what I was really looking for.