Shipping by bus, terminal to terminal, is pretty cheap- $65 to ship an old ford truck hood from California to Connecticut. Unfortunately, Greyhound's nearest terminal calculation is apparently as the crow flies, so this ebay seller sends my hood to Bridgeport, CT instead of Long Island, completely ignoring the presence of the Long Island Sound. Sounds like Greyhound may forward the item to LI at no extra charge, and I'm in no big hurry, so all is not lost.
Those of you who have bulky, low value items to ship might want to consider using Greyhound- but check on the other end as to which terminal is easiest to get to (by truck, not by plane or boat).