[Boatanchors] Heading to Chicago: Any Good Surplus/Electronic/Boatanchor Places?

[William Morton]

Hello All,
Happy Autumn to everyone.  
My family will be heading to downtown Chicago for a few days as the kiddos have fall break from school.  Does anyone know of a good place to poke around for interesting stuff (sockets, tubes, stuff with very low 'wife approval factor' ratings)?
While our time is limited to only 2 full days, we have left some time for unscripted adventure....
Thanks in advance for suggestions.
Best Regards,
William