Entry-Level Tandem Bike

Hello,

I am (will be) looking for a tandem bike for my wife and I. I have gone riding a few times with a friend of ours, and we would like to drag my wife along. She, however, feels like she would slow down our pace too much and therefore make the ride less enjoyable. The rides, however, are for excercise as well as recreation (certainly not training).

So, one solution was to get a tandem bike. I have done a little looking around, but it seems like they are very expensive from the start. Are there some entry-level bikes that are still good quality, but not too bad on the wallet? Another way of phrasing the question: what should I expect to pay for an entry-level tandem bike?

Thanks for all of your help.