Yes, MC is hard to find from the commercial fruit orchards, as it's relatively new to FL. And, even if you can get your hands on one, obtaining one that is at the right stage of ripeness may be a challenge. Even though I had access to the fruit (from Harry Monster's orchard), it wasn't until I grafted a tree for myself and harvested fruit from my own tree that I finally understood what all the excitement was about.
Unlike a carrie or any of the other mangoes that can have offensive characteristics to the a mainstream consumer (eg, soft flesh, strong resin flavor, etc), the MC is one that seems to have broad appeal -- to both the connoisseur and the novice.
You may want to attempt a visit to Harry's orchard in southern broward for a testing.