Hot tub pad

Have not used them. 

What is it about these that you find attractive?  You still have to do the site prep.  You have a stable level surface.

Likely to be less expensive than concrete, for sure. 

Basically it is a big pad.    When I had a blow up bubble spa I put it on those interlocking square foam pads you put on a shop floor.  Same idea.  Worked great.
 
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