67 posts later and I finally get around to answering.
I asked this question because I had just paid $250 for a boxed Atari 2600 "Lochjaw". You may have expected that I've paid much more for some of the other things in my collection, like the boxed "Malagai", boxed "Video Life" - both of which would go for well over a grand if I were to sell - or the piles of prototypes I've amassed over the years, but you'd be wrong. Fortunately I've stumbled into lots of great stuff mainly from just being in the right place before everyone else or being terribly persistent with owners (you know who you are).
So that's it for me, $250 for a boxed Atari 2600 "Lochjaw". Closest to that would be $200 for a boxed Intellivision Congo Bongo.