Marshall - 2:26 pm on Apr 28, 2012 (gmt 0)

The snippet should be on the page where the product is sold from, not an aggregate page with multiple products. If you have a product detail page, it should be there then only one snippet per page, otherwise it may be seen as spam. However, I have noticed the Google does not seem to be displaying rich snippets like they use to, possibly because people are gaming them.

Marshall