As others have already opined, hamfests are a great source for old test equipment. Everything you listed is generally quite common at hamfests, and, with the possible exception of the tube tester, can be found rather inexpensively with only a minimal amount of dilligence, provided you're not particularly fussy about specific brand/model/age. [...and you might just luck out on the tube tester.]
Check the AARL hamfest directory at
http://www.arrl.org/hamfests.html/ for an upcoming hamfest near you..!
Also, I agree with julianburke regarding MCM. I've place a number of orders from them over the years-- very good service and generally fair prices, especially in certain catagories, though I haven't bought all that much test equipment from them.