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Re:Introducing the Priceonomics Business Model: Data Crawlin... by highbees on Tuesday November 26, 2013 @04:00PM (#6804164)
Although it would only be available for a fraction of prices, delta in "quantity available" between scrapes could provide some data.

Most websites don't relay this info to the end user but it could be used on those that do.

Re:Introducing the Priceonomics Business Model: Data Crawlin... by chad_c on Tuesday November 26, 2013 @04:03PM (#6804179)
I'm pursuing something even less structured -- forum posts. It may be a lost cause.