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Yes there is, especially for local SEO. Chamber of Commerce for cities are awesome links. The cities usually require a yearly fee to obtain these do-follow links.

No, I would make sure it's the best use case for you. Sometimes you can store this data in a cookie. But there are still great ways for just SEO that can help you with making sure that it won't hurt. Usually the best way is still having a canonical tag on the page that matches with the page that the content is originally from.