Boot sales are something I've experienced in Scotland, and in the greater-Vancouver area where they're called 'flea markets' and held in parking lots. Today we attended a rural yard sale, which is the way thongs are done our immediate area. This one was, in part, an estate sale for the possesions of a mechanic who recently died in his 90s.
I'm not a big acquirer, though in my 20s and early 30s I did obtain many useful things this way. Today I bought numerous lengths of steel rod (I use those for making and repairing things for myself or friends). Also a welding mask that is better than the one I've had. also some threaded redi-rod. And an 8x10 picture frame.