I ran the Kelley Blue Book like Suginami with both Atlanta and North Carolina zip codes for Islander's car and came up with this low figure. But I personally am suspicious of the KBB.

I have a '90 300SL with 115K miles. The KBB says it is worth $11,500 in excellent condition (30345 zip code). Well, I am pretty sure I can get at least $15,000 in a heartbeat. And the marketplace suggests considerably higher values. Looking at eBay you don't see any of these cars trading hands for less than $15K. And at www.cars.com nearly all of the 300SLs fall in the $19K - $21K asking price range.

I'm going to post a new thread on this topic to solicit a broader range of opinions...