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I put descriptions in for each of my product categories a couple months ago and a few of my category pages rank high.  The problem is that most of my category pages have the wrong meta description on the SERP.  The descriptions that are shown sometimes have the home page description, which isn't a big deal, but some have descriptions of different products and most have descriptions of sub categories.  Below is an example of a subcategory description (specialty feeders) for a main category:

Co-matic Power Feeders - Products - Shop Gear Inc

<cite>www.shopgearinc.com/products/co-matic-power-feeders/</cite>‎Specialty Feeders. Specialty Co-matic feeders are built for use on a variety of machines and for specific operations. Shop Gear supplies a variety of specialty **...****Any Suggestions?**Thanks

I sell machinery branded Co-matic.  Most people search Comatic so I was wondering if I should change my keywords from Co-matic to Comatic.  Would the change have a significant impact on SEO?

Thanks!

I have duplicate content for all of the products I sell on my website due to categories and subcategories.

Ex: http://www.shopgearinc.com/products/product/stockfeeder-af38.php

http://www.shopgearinc.com/products/co-matic-power-feeders/stockfeeder-af38.php

http://www.shopgearinc.com/products/co-matic-power-feeders/heavy-duty-feeders/stockfeeder-af38.php

Above are 3 urls to the same title and content.  I use a third party developer backend system so doing canonicalization seems difficult as I don't have full access.

What is the best to get rid of this duplicate content.  Can I do it through webmaster tools or should I pay the developer to do the canonicalization or a 301 redirect?  Any suggestions?

Thanks