Our guide, a well known local stopped at a roadside vendor where he purchased us some bananas. The price was 10TT.
The guide had to lend us the money because we didnt have bills small enough and they couldn't change a 100.
We also searched far and wide for mango but it must have been out of season (1st week of June) as mangos could not be found at any vendor on the island (and we did the entire island tour twice). A semi-crazy local was pestering everyone on Turtle beach to sell a bag of various fruit he was dragging around. Whilst not impressed with his inventory, I asked him if he knew where to find mangos. He ran off and a short time later I found 3 perfect mangos on my lawn chair. I found him shortly after wandering about and paid him 10TT.
I was feeling a bit cocky as I applied some business savvy to the other "vendors" and ended up selling them
a pair of sunglasses that I had found on a tour.
(nobody had claimed them!)
Finally our cab driver stopped at a friend of his house where we picked about six mangos off the ground from under his friend's tree right on the front lawn. The mangos were small but perfectly ripe and no insect marks or anything. Again, we had trouble paying the tree owner 10TT for the mangos because of the small denomonations.
This year when we go I am making a point of carrying a wad of small bills to pay for fruit and small items like this.
Moral of this story is overall I cannot say the price of fruit was expensive. When I did the math, I paid less than $2 for a bunch of the best fruit I have ever tasted. Compare that to a fancy dinner at a restaurant there which can run you well over $700TT and you can see the fruit is well worthwhile to buy.