Where to advertise experience design studio?

I've launched an experience design studio to concentrate on UX Research & data-driven design for SaaS products. I have a multitude of completed projects and now describing them in case studies but I'm wondering where we need to advertise these for sale. As a group of entrepreneurs, I'm wondering where you would look. The price point is generally $70/hr. Google PPC is one option but the CPA calculation seems high at the moment.