I use Yelp and have been very satisfied with it's results. The amount you spend depends on how many areas you want to cover. You can start off with just a few (5) cities and grow from there after you see the results. The key factor with yelp is offering customers an opportunity to go online and share their thoughts of their completed projects. The other key point about Yelp is that we find the Leads to be legitimate, not like some of the other sites ie; Home Adviser.

You will be assigned a sales adviser if you work with them and complete your entire profile 100%, I think you'll be surprised with the results. It is a small cost of doing business, it doesn't take to many sales to pay for itself.