I've seen River Service panels go for $100(unpopulated) but having Sega Blast arts would make it more desirable. Personally , I'd go $50-80 on panels, but I'm a cheap skate.
It was part of a Capcom Impress I picked up. Since I found an Impress CP I swapped it out. Price directly from Japan is 17K yen before shipping from Mak Japan. http://www.mak-jp.com/supply.html