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I would try the Smartsection module, available at Smartfactory.ca .
It is a good module for presenting anything in a hierarchical format (with main sections, sub-sections, and individual pages)
If you can't do what you want on the product page with the built in editor from that module, I would create a html page template yourself, and then link to that page from the product or article page as it is called in the module.
This is what I did here for each of my article pages:
http://myottawa.ca/modules/smartsection/item.php?itemid=29It doesn't really look like it, but each article is actually made in a separate html page, that is loaded into the article, rather then being written in the article editor itself. This is so I could display different Adsense code beside the text of each article.
You could do the same thing for a product page, but with more fields for the price and description, etc.
Doing it this way is also really good for SEO as well, as you end up with a folder on your site full of these html product pages....good food for search engines.
Hope my thoughts were useful to you!
jeffgr