Getting your feet wet with cavern tours can be VERY expensive, though . . . Next thing you know, you're taking cave classes, buying doubles and diving them at home, running line all over your back yard -- Beware!
LMAO aint that the truth! If you want to travel around the globe and dive all these places it takes some $. When you think about it the training and gear are actually cheaper than the travel (up to a point, not including tech level).The local trips for me cost quite a bit in gas, tolls, food etc. before I even add in the boat fees, fills etc. Even though some of these Cenote dives can be done at OW level it sounds like a trip to FL for a Cavern class would not cost all that much compared to a Mexico trip and you'd get some awesome training in the springs as well.
On another note, once you get a Cavern or Intro cert do you just pay a fee to dive the Cenotes? I suppose if you get Intro you could hire guide and do a basic cave dive?