Shipping for Rockets are not something cheap. I paid $320 one way to Sacramento, CA for my R850, R450, and Big Foot. It would be cheaper to resell than to reship it back for another $320. The total of $640 for speakers that you won't even own is a lot of money. I don't know about you but that is A LOT of MONEY to throw away for me. With that said, shipping from Yellow is hands down the best delivery company I have ever dealt with. There is not even a single scratch or dent on Rocket boxes.
Free shipping is offered for their small speakers for test drive but that is kinda hard to get a feel of what a Rocket 850 is from a small speaker. IMHO it's like test driving a Toyota Tercel and based that the Tercel drives like a Supra. Eitherway, give yourself a few days to see if you can get a response from someone at AV123.
From my reading, a big factor that influence sound is ROOM TREATMENT. Be sure to save some money for that as well.