In this Internet age, opening the Yellow pages to search for a business is outdated. Most people will go to the web instead.
If you are a business owner in the US, you are most likely listed on Merchant Circle. It is an online directory of every business owner in the country with loads of features and services. As a business owner, you can claim your business page and further customize it with pictures and videos, putting up coupons for special offers and even start a blog.
They have 3 packages to choose from in order to promote your business. The Starter Plan is totally free, whereas Gold is $29.95 per month and Platinum is $99.95 per month.
Merchant Circle is more than a directory. It is in fact a social network for business owners - a place where they can exchange ideas, promote themselves and much more. The Merchant Circle Forums have some really interesting threads going on. For example, one thread is on "Innovative ways to promote your business". I think a lot of businesses might find the tips useful.