I would first set up an account with FedEx (or UPS), it is free and they give members discount. The more you ship the more discount they give, but even first time members shipping for the first time get a discount over the usual rate.
There is also an on-line auction website called 'U-Ship' that I think people bid to ship your items for you. My brother used it to setup shipping his motocycle from California to Washington state.