Add an indication that the product you're viewing isn't the lowest known price
I wish it were more evident when there is a lower price available on an item. For example, I got a price change alert on an item, but in the list of other retailers, one of the prices is much cheaper...
I can see the benefit of tracking price changes across different merchants (what if a price is cheaper at one vendor, but the overall costs of dealing with them are higher - such as having to pay shipping or other fees).
Still, it'd be nice to have a little icon maybe that indicates "Warning! This is NOT the lowest price we have found on this item!"