You should try being more specific with your keywords in CPC. ie 'blue
widgets' 'red widgets' 'buy widgets' this should help you get more
"quality" clicks. Websites like bizrate, are good but they are also
very competitive. Most people going to bizrate, or shopping.com,
etc... are pretty price conscious. Also, people going to bizrate, may
not stumble onto your product, people searching, are people searching
to buy.

Hope this helps~

Thanks for all the response.when I posted this topic I thought It will
start a good discussion about the whole CPC/shopping comparision site
Issue.But I think people do not want to discuss this issue.
The truth is we are all using internet only to find bargains, only
willing to pay much less than what we could be charged in a brick and
mortar store, so there is an opportunity for small businesses, but the
cost of getting orders is just so high.
My understanding and experience is do not use CPC if you only sells
stuff where you make only 5-10 a piece.
Any comments?

[ Moderator's note: followups to this and other posts will be delayed
several days. -JimL ]