My wife and I have three cats, but we really, really want a Boston Terrier too. We live in a city, and Bostons don't need much room to run or exercise, (a lot like us, actually). The problem is getting one for less than 700$...
Boston Terrier rescue is very active throughout the country. There have been several available in my area lately (MN). Check into it, they're great dogs, I have 2.