Bargain sites are useful for highlighting specials, but don't readily identify the pricing history for a given item. Shopping tracker site Mild Surprise runs twice-daily price checks on items for sale online at JB Hi-Fi, Harvey Norman and Officeworks, and highlights goods that have seen the biggest price changes.
That in itself makes for interesting shopping fodder, but what makes Mild Surprise really useful is the ability to create a watchlist of individual items and set a price threshold. (That requires registering for a free account.) You can also search for products to check out their pricing history.
The interface and design is very basic right now, but this could potentially be a very handy resource for bargain hunters. The site developers say they are working on adding additional retailers.