The LBS might have bike boxes, already broken down but usuable. I put 6 of my bikes when I moved in those by dismantling and using a lot of bubble wrap. That might save you a little.
I found this on the internet:
"Amtrak also has a service that takes bikes, Package Express (800-377-6914). A bit erratic, it may be worth looking into if you live along one of their routes. Greyhound, too, has a Package Express (800-231-2222), but if you're willing to send your bike away, alone on a bus, you may as well duck tape it to the roof of a passing car and hope it magically arrives at you destination."