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Chemistry.com
The good -- for the first 2 weeks, you'll be given high quality matches. The response rate for chemistry.com is about the same as most other sites.
The bad -- after the first month, the quality rapidly fades. You'll be given good matches who live 2 hours away, or inappropriate matches nearby, etc.
There are a number of things you can do other than email, but I've not received a response on anything but emails, so they're a waste of time.
There is no searching capability. You'll get as many matches as they give you, which will start out being 5 a day, and drop to 2 within a month.
Save your money and time. OkCupid or PlentyOfFish are better.