Hello,
Before the economy took a dive, second-hand Series basses were changing hands for about $4,000 US, but in a worldwide recession priorities have certainly changed. The used bass market seems to have fallen off.
Another factor to consider is the relative rarity of six-string Series 2s. I'm not sure how many have been made over the years, but the number is small. If the bass you're looking at is as good as mine, I would urge you to spend whatever you can to buy it. You only live once, and it's only money.