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I think BOTW is a good citation source, but if you can't get it for free the best thing to do is test. If you're thinking that site will be a valuable piece to your marketing (and deserve a piece of the budget), then test with the first location to see how much traffic it drives. Set up a special segment or filter in Google Analytics to track referrals from BOTW. If you're seeing some decent traffic for what you're paying (and possible conversions), then it's definitely worth expanding to. If you're just paying for the citation source then you might be better off sinking that monthly fee into paid search or somewhere else. I agree BOTW is a good local citation to have, but that's what I would do to try and justify spending money on it.

this tool may be of help to you it seems like it will. http://traackr.com/ is what you want Use http://totally.awe.sm/  whenever any network and track it that way you share links on all of the social networks their are other tools one is called mention this will track your influencers however I believe the For Twitter https://followerwonk.com/  is the best for twitter by far I know you did not ask about the however I thought  it could not hurt http://binkd.com/marketing/5-tools-to-identify-your-social-media-influencers/

Here's one example --  http://www.statefarm.com/agent/US/CA/Pleasanton/name omitted-7X4H03GS000 . The Domain Authority is 93 for this agent page and page authority is 44. I checked a couple of other sites that use subdomains. One site used a www domain address and redirected that local branch/affiliate to the subdomain. In this case, local control was a requirement. See http://www.ameravant.com/article/3398-subdomains-and-seo-pros-and-cons-of-subdomains-vs-subdirectories for a good article on pros and cons of subdomains. Hope this is helpful.