If you followed the links you could figure them out, but I guess you want help with that.
The camel thing produces graphs of prices over time. That way you can see if the current price is common, overpriced, or a good deal, at a particular store.
Invisible Hand, on the other...you know...comparison shops for you between stores, and shows you which stores it thinks currently have a better price. (It's not always right.)
Look for really
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