anticipate to only find Z's na or tt that have 120K+ mileage. If you drive the car and it drives good or still boosts strong for a tt, then there are no reason not to buy a 120k+ mileage z. If I were you try to come up with a few more $$ so that you can be in the budget of $9-10K to get a "better" Z. Most Z's you see on ebay or craigslist for $5-6K are pretty crappy and need some kind of work. But sometimes you do get lucky and find a good running na or tt for $5-6K. Its all about timing.