I just picked up a used Sundance Altimar spa (pretty good size and heavy - 820 lbs) and after talking to enough people, I just hired it done. In fact, a friend of mine just moved a similar but smaller spa himself (with several other helpers) and wishes he would have just hired it done. Cost $350 but well worth it when I considered the alternative of gathering a bunch of people to help. Funny enough, only two average-sized guys moved this thing! The worked smart, not hard and relied heavily on a custom dolly they made. This particular outfit has supposedly moved 15,000 spas around the area here. They certainly knew what they were doing and to me, was worth the cost.