Have anybody used shopping.com, are they any good? as to traffice of course.

I used them before as a consumer. If you can at least match your competitor's pricing on there you might have something since most people go to that site just for comparison shopping

Thanks, but I'm talking about as a merchant.

Sure - it can work if your product is unique or you're offering a cheaper price than that of your competitors. I'd take a look at their CPC rate card (https://merchant.shopping.com/enroll/app?service=page/RateCard) before signing up, they do look pretty steep.

That's why I said as a consumer. The majority of users on this forum will be web hosting or related more to that, not selling too much on that website. You might try a few other forums as well - like small business related forums that the users might have more of a tendency to use that type of site