I think it depends on where you are located in the country too. I'm in Tennessee and the boston's here range from $250 to $450. I've seen unique color ones like the brown and white for as much as $700. I've also looked online at Boston Breeder's in other parts of the country where they are charging much more. The one's I'm looking at here in TN are also ckc or akc registered.
I'm still debating on getting one. I have a 7 year old female bullmastiff. We are very spoiled in that she's a very lazy dog and very well behaved. I'm debating whether or not I want to deal with a wild new little pup.

Rachel