Consider going to a restaurant where the locals dine for your Peking Duck. Ok, you may not get the fancy furniture and uniforms that you will get in the touristy restaurants, but what you will get is a restaurant full of character and, of course, local people.
Think about it, if you have been to any of the advertised Peking Duck restaurants for tourists, have you seen many locals ? Of course the answer is probably no. The reason is probably due to the costs involved.
Myself and a few friends went to a restaurant close to a Hutong and had Peking Duck for three people. It cost less than £7.50 for the whole meal including beer and cola, not bad for three people. The portions were very large and we couldn't finish what was served.
Do consider trying a local restaurant, you will be amazed at the reception you will get and the locals will enjoy you as much as you will enjoy the experience of dining with them.
Is this your business?