a bicycle built for two

I want to own a bicycle. I had one when I was in college, because doesn't every college student own a bike?
But now, well. I have the little berry girl and I wouldn't want a bicycle if I couldn't take her along. The problem is that while I can afford a nice enough bike, those baby carriers that go behind are quite expensive. I have looked on Craigslist and ebay but haven't found anything affordable and nearby. This is a common problem with large items so perhaps I should just keep waiting for the perfect one to come along.
Universe, I am petitioning you for the perfect bicycle, complete with a baby seat. Hear me, please, because really this is a petition for my old body to return (and we can all agree that would be nice).