The guy I bought mine from said it originally shipped in like 18 pieces. that might be the cheapest/easiest way to do it if that's how Argosy does it.
I have the Dual 15 and it's very heavy when put together.
Yeah, probably disassembled would be better for you. You could rent a uhaul and get it, but weigh up the costs. If it's coming from a business, you can ship business to business (b2b) with a company like db schenker. i had experience with them shipping some mcintosh amps to austrailia. you have to have tax id numbers etc and they send a guy out with a truck to pick it up and your done!
Companies will ship ANYTHING, it's just gonna cost more the larger the package. Get the dimensions figured out and call ups,usps,fedex,dhl, whoever and get quotes.