Are these spas at Sams's club or Costco stocked, or are they shipped from a warehouse somewhere, perhaps from the manufacturer? If so, I'm sure the cost of returning the spa would be on the consumer.
You can pay for your spa once (Good quality insulation, lower power bills) or you can pay over the years of ownership. (poor insulation, higher power bills).
I'd rather give my money to the spa maker than the local power utility.
Brewman