Not sure Steve, but I recall seeing something around P12000 on promo for one year unlimited. Quite expensive in Peso terms.
When we lived in Northampton we paid £600 per couple per year for a small club.
When we lived in Kent we paid £120 per month per couple at Holiday Inn Spirit club.
Those UK clubs charged huge amounts extra for massage etc.
Anything involving largely labour costs so little here just now.
I'm sure that will change over the next 10 years or so though.