About 10-12 years ago, a small cache of mint Spook's Trip games was found and briefly washed over the market. I haven't seen that many unused examples since then. Beistle produced this diminutive game during the 1950s. SGV is $100.
08/21 Update: This sold for a strong $152.50.
09/25 Update: Another sold on 09/21 for $169.16.