OScommerce on site SEO for 2 x sites

I have 2 sites that are on oscommerce and while I have linking beibg done on them, I need the sites set up better on a wide product basis in order to give good SEO results.

I am looking for a one time audit and code alteration to include dynamic metatags and keywords for the respective products.

If this improves ther SEO, I will be using this individual for other jobs as I also sell and market websites for a number of companies.