Scour the internet and find other sites that might want to link to your client's site (site:website.com "submit a link"). You can use tools like //fiverr.com/ , but remember the importance of the source of your links and the anchor text used. 100,000 links from spammy sites with bad anchor text will help you less than a single link with excellent keyword anchor text from a super authoritative site. You should also consider your local chamber of commerce, local networking groups, and local complimentary businesses. Search engines like to see local links pointing at locally targeted websites.