LizaJane - 7:34 pm on Aug 22, 2007 (gmt 0)

Let us compare apples with apples.

Shopzilla, shopping.com, nextag - these are comparison pay per click sites. ROI is certainly a factor to consider. We do not have any experience with these sites.
Froogle ( now google base) and sortprice are ( currently) free, as in no fee per click. Though we are usually in the top 3 results on google for most of our keywords, we do utilize both googlebase and sortprice. We have had very good results from froogle and modest but worthwhile results in sortprice.