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Here are some things to help cut down on duplicate. Take a look at the website and answer the following: All have unique title tags Unique team specific h1 tags Have you put information such as what division the teams are in on the product page? What about any other popular information? Write some content about the popular players, team colors or info unique to the area. For example I am in Philly and of of course bleed green so why not say something in the product description like "Show off your Philly spirit next time you are hanging in South Philly eating cheesesteaks" or something that relates to the city. Of course be more creative than my two second content but you get the idea Do you have product reviews? If not, get them on and make sure they are indexable. This will help cut down the duplicate content.

The answere is to add unique content, but in your situation this will be hard to do. i would have a catagory page, for each product group, like mugs, with links to each team mug, then i would canonical tag all the mug pages to the category page, i would also have a team page linking to alll the products. Your problem is thin content, a few pages is ok, but if your site has a lot as you suggest, i would do somthing about it