There's some 3DS people trying to get a Chinese firm to do it, and they want $20,000 just to image the chip. No actual modification work.
You need access to machines and tools worth millions. Hobbyist level techniques like nitric acid and etchand sand to stain the ROMs just doesn't work even at SNES-era complexity.
It could be done for less in bulk, the issue is supply and demand. Very, very few people paying for this kind of work combined with wild costs for equipment.
There's some 3DS people trying to get a Chinese firm to do it, and they want $20,000 just to image the chip. No actual modification work.
You need access to machines and tools worth millions. Hobbyist level techniques like nitric acid and etchand sand to stain the ROMs just doesn't work even at SNES-era complexity.
It could be done for less in bulk, the issue is supply and demand. Very, very few people paying for this kind of work combined with wild costs for equipment.