A good source for finding clients who are start-ups who need web design services is Charlie Page's "Directory of Ezines." You can reach a huge number of potential clients and build your opt-in list.
Have a look at the Lifetime Membership and see if it meets your advertising goals.
The Directory of Ezines is the first e-zine directory on the Internet offering e-zine advertising, article distribution, joint ventures with e-zine publishers, free classified ads, discounts on e-zine advertising, and with a lifetime membership Charlie will write a few ads for your business. A lifetime membership is $150.
http://www.lifestylespub.com/
And also, try Google! And maybe Yahoo too.