Is it cheap to stay in Martinique? Yes!
Wild beaches as a camping site.
Free self-cleaning toilet.
Fruit growing on the street.
Baguette for 1 euro
Rum 0.7 l for 4 Euro
Wine 2.5 euros
Very good ready canned food, produced for the dictation of sailors
The cost of staying in such conditions is about 20 euros for 1 day for 2 people :)
But you can also go crazy, and treat yourself to a 10-day yacht cruise in the Caribbean and taste the luxury: D