Can anyone give me some advice? I'm using a Crystal Engine/Movie Advance SD Version GBA Movie Player in order to create flash carts, but although it seems to allow 2GB SD cards, the largest size file I can actually use with Goomba is 261k. Is it in fact possible to flash ROMs of >261k? If so, are my difficulties attributable to the fact that I'm using an inferior product? What would be the best flash cart on the market? I'm not infinitely rich so as a follow-up, what would be the most reasonably priced (but still good) flash cart?

NOTE: I am not at all interested in illegal ROM game copying, but instead I am interested only in the free demoscene ROMs like Paragon5's "Music-Disc No. 1" you can find freely online. So please keep in mind my needs for this question.