Hi Tom
Short answer is that it probably won't be a problem. From what you are saying the duplication is 'natural' in the sense it is information which you might normally expect to see duplicated since it relates to similar products across multiple sites (also think privacy policy or terms and conditions pages). In this case it is unlikely to attract a penalty.
Matt Cutts covered that topic in this video (posted on SearchEngineLand): Duplicate Content Won't Hurt You Unless its Spammy.
However, it will probably mean you are leaving it up to the search engine to decide which 'version' of your duplicate content it should prioritise and serve up to people searching. If it is not important to rank for the content on these duplicate pages then again it is not really an issue.
However if you want to play safe or aim to get some rankings for a specific page - among all the duplicate versions, you can use a rel=canonical tag to let the search engines know which page is the "original" so that they will prioritise this one (ie point the link juice at a specific page). Matt Cutts talks about that in this video (although he talks about it in the context of a news article).
Check out this Moz article on Duplicate Content - it also has a short explanation on how to use the rel=canonical.
All the best
Neil