I ran into this while searching for some details on one of the saws I just acquired. It is a collection of tips that originated on the old tools email list more than 10 years ago. It is generally geared toward old hand tool enthusiasts, but much can be applied to modern tools as it deals more with people than with the actual tools.
The tips focus on a flea market setting but also apply to garage sales and estate sales. The people targeted include significant others and the people selling the stuff you want. It made me laugh and say “why didn’t I think of that” several times.
I’d like to post it here but due to ownership restrictions, I can only link to it.
-- Galootish log blog, http://www.timberframe-tools.com