That's exactly the kind of information I show on CompareStorePrices.co.uk but unfortunately (or I guess for me fortunately!) you cannot obtain this information automatically.
I tried for a long time to see if was possible to match products from multiple merchants automatically but you just can't at the moment (and I would argue you never will unless a company like mine does the matching and then makes it available to others).
The problem you have is "product a" from merchant 1 might not be quite the same as "product a" from merchant 2 (for example a Canon EOS 30v from 1 merchant is the camera body only and from another merchant it includes a lense even though the Make and Product are identical!
The other problem is a "Hotpoint ABC123" from Merchant 1 is the same as a "Hotpoint A/BC-123GB" from Merchant 2.
We had to develop our own product maintenance system and employ people to match the products.
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