shelby--I think you got a good price. They 'might' go down a little, but with projected fuel price increases, they could also go up up up. I'd say you did just fine.
Also to another poster, flying Delta out of Logan is about to get REALLY easy. Delta's new Terminal A is just about ready to open, and once that does, there will be no more 'grand tour' of Logan, it's the first terminal, and you don't have to loop ALL THE WAY around to get out of Logan, there is a surface road that brings you right back. I would go to Logan in a heartbeat to avoid a stop/plane change.