hey guys, im looking at purchasing a use bass tracker (somewhere between late 90s and now)  whats the typical price for one of these guys?

Depends on the length and motor horsepower.

I would think under $8,000 if the boat is in excellent condition with a 90-HP Merc in good condition without a high number of hours.

OK guys, what do you think? 

There are too many variables to answer your question with any sort of accurately.  Anywhere between $6000 and $20,000.

Go to the NADA guides and look up various boats and motor combinations and you can get a pretty good idea.