Nice score! Meteorites is the only game for the 5200 that I don't have.
I had the opporunity to pick one up once at the CGE 2000 (or 2001 don't recall for sure). The vendor had 3 of them for $100 or less complete (new) in box. The person in front of me bought all 3. Still bitter about that after 9 years. I was at least able to purchase a boxed MasterPlay interface before he bought the rest of those as well.
That stinks, that happened to me once at a flea market. Guy bought a bunch of Coleco games in the box right in front of me.