Take out an inexpensive advertisement, either in a local pulbilication, and industry related magazine, or even a banner advertisement on a niche related website. Getting in front of the right audience is the key to placing advertisements.
Facebook ads for your services can be quite effective and relatively inexpensive if you narrow down your target client and get very specific with your ad targeting.
Advertise on popular message boards. Look for message boards in your industry where your target market gathers and advertise there.
Need help narrowing down your target market? Download Alicia’s Ideal Client Worksheet here.