If it's for white goods, http://www.PriceRunner.co.uk is good. Otherwise Google/products is quite good, although it helps to put -ebay in the search if you want to avoid ebay stuff - http://www.google.co.uk/prdhp?hl=en&tab=wf
And a check on Amazon and John Lewis is always worthwhile.
Never had a problem with Amazon but then I've only used them for relatively small stuff: books, DVDs, CDs etc. Largest thing was hedgetrimmers: just what I wanted at a good price. Hope this helps.
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Read a report on them not that long ago, I think the number one site offered like 68% accuracy.
Otherwise Google/products is quite good, although it helps to put -ebay in the search if you want to avoid ebay stuff - http://www.google.co.uk/prdhp?hl=en&tab=wf
And a check on Amazon and John Lewis is always worthwhile.