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Btw, there is a section a bit further down listing deals in each region. You might want to check that out for more specifics.
The consignment shops and Goodwill/SA-type stores are really hit-and-miss. Moreover, if the set is a small set, the price difference isn't going to be much. The larger sets are where you can "make up" the value.
I think that Target clearances are the best sales.
Amazon sales get jumped on pretty quickly so your chances of landing one can be tough.
Also keep an eye out for alerts like these on the Brickset home page: http://brickset.com/news/category-Amazon-com-watch