Other Problems
When I do a search, a store that I know has my book doesn't show up in your comparisons.
When you perform a price comparison on AllBookstores.com, our robot goes out to each of our many stores, and checks their prices in real time. There are many factors that can cause a store to be excluded from a comparison, and they are:-
The stores web site is down.
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The stores web site is under a heavy load, and not responding to our robot in the time allowed.
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Network congestion on the Internet.
Most of these issues are only temporary, and are resolved automatically when the above problems are resolved.

