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We have a e-commerce website. Our own homegrown:-) We recently visited Google Webmaster tools and could see that Google mention we have double Meta tags for some main and subcategories. Each Product Category on our site have a subcategory/ Sub url -  "Bestseller", "On Sale", "just arrived".  The sub url is not a really a real category and we can therefore not make totally unique description and title for does urls. domain.com/category domain.com/category/bestseller
domain.com/category/on-sale
domain.com/category/just-arrived We are thinking about 2 solutions. 1. Canonical Url on subcategory pointing to main category.
2. Or add a word bestseller, on sale or just arrived in front of the meta title/description. We can do this from code. I personally opt for option 1. But I am little unsure what is the best way to go. Thanks in advance for your advice