I have a feeling that they're dirt cheap there due to Snatcher being on like 3 other systems in Japan, like the MSX.
It is cheap. I got my PCE version for under $1... but really, what's the point other than collection purposes? Unless you're pretty fluent in Japanese, it's unplayable. The Sega CD isn't even region free. He'd also need to pick up a Mega CD/Mega Drive combo.