Just to clarify, was that having someone build it, or you build it? I'm just wondering because a friend had one done a couple years ago and it was 40k assembled on a flat pad. I think the only extra was basic electrical. But maybe prices have come down, I know that was about the cheapest quote they could find for 24x24.
If you want to save some money you can do compacted road crush instead of an extra pad. It is quite firm, obviously not quite as nice, but no worry of future cracking.
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