About 5 years ago I started shopping for my current truck. Wanted an unmodified 1987-1991 K5. I couldn't believe where the prices were. Even trucks with cancer on fenders, rockers, and quarters were bringing 2 to 2500. I wanted a pretty much cancer free truck. I found my current K5 for 3500 bucks, silverado with every option, and knew I payed out the nose. But not dealing with cancer was worth it.
Fast forward to this past week and I was doing some browsing. I can only find a few locally but the listed prices are now 5000 to 8000 bucks. Might not bring that of course but it won't be too far off.