eBay is a good place to start. What you want to see are actual SELLING prices, not asking prices or "buy it now" prices. So you'll have to sign up for an eBay membership (it's free), do a search for your bass, then under the "more options" stuff on the left side of the screen, click the checkmark for "completed auctions" - that will show you the actual selling prices.
You can ask here on TB, but only IF you're a $supporting member.
"I have no actual information, just what the salesman told me."