Like mentioned, games from this era are super easy to fix most of the time.
I'd go for it if your looking to learn, $800 is a descent price for a project globetrotters.
Just keep in mind, getting a game like this to play well/reliably is usually a big undertaking.
Especially if you've never done one.
Most of my early SS games I put way more into them (hours, $), then I'd ever get selling them.