I see that the XE Demo Cartridge gets an entry, so what about the In-Store Demonstartion Program Cartridge (CXL4019)? Are there no playable demos on it or anything? Also, what's the rarity of it?
Nope it's not a playable demo. The only input is when it asks for you game at one point. The demo is kind of insteresting and it plays a funky tune (Disco Derge).
As for rarity, I'd say a 5. You can get them still from some dealers, but they're getting hard to find.