I recently purchased a Japanese sit-down cabinet (the Super Neo Type II) and 4-slot board from Arcade-Infinity and had them ship it to Manhattan. Shipping was $225 -- not cheap, but not outrageous considering the distance, and you really can't find these cabs on the East Coast. On the positive side, their shipping company not only delivered right to my door, but the delivery guy helped me get the cab into my apartment and unpack -- an unusual thing in Manhattan, where most delivery companies just drop the crate at the curb (if they'll even go into Manhattan at all). On the negative side, the packaging included placing shipping tape on lots of places on the cab itself -- I'm still trying to get all the tape residue off.
I once looked into separately arranging for a shipping company to ship a cabinet from a private seller's house in LA to NY. Unless the seller is willing to crate the cab and deliver it to the shipping company, the cost to ship is absolutely prohibitive. Be sure you know exactly what shipping will cost before you commit to buy a cabinet on ebay!
I second Galford Forever's view that the sit-down cabs are great, especially if (like me) space is at a premium and your spouse isn't interested in having a 6 foot red arcade cabinet around the house