Given the proposed size of the 3DS games, I don't know how useful a flash cart would be seeing as SDHC only goes up to 32GB.
If a flash cart had support for MicroSDXC, I would definitely buy one priced from $50-$80 as long as it was nice quality.
If a flash cart had support for MicroSDXC, I would definitely buy one priced from $50-$80 as long as it was nice quality.