Both advertising options are affordable (starting at $7!) and more interactive than just a button in the sidebar. The premium ad space includes promotion on social media and an individual feature post. Medium advertisers will also be promoted on social media sites and share a "sponsor spotlight" post with others in their group.
A limited number of free button swaps are also available.
Sound like a good fit? Full details and payment info can be found on the advertising page. As a small business owner myself, it's important to help other small companies grow. I'd love to have you on board!