Some of these dive boat operators provide guided tours, whereas others merely provide transportation to the dive site.  I will try to specify which is which.  Some are people I've heard of, others I've met.

West Coast

Mona Aquatics

Francisco Garcia huertas (Don Paco)

P.O. Box 195

Boqueron, PR, 00622

(787) 851-2185

(787) 312-3882

Located In the Boqueron yacht Club Trips to Mona in half the time other operators take to get there. 42' island hopper 'Orca Too' 1000+ HP full dive boat.
Trips to Mona or desecheo every weekend, ferrying for campers to Mona.

 

Moncho

I don't know his full name!

Carr. 107 Km. 3.6

Bo. Borinken

Aguadilla, PR 00603

P. (787) 891-2786

Moncho is a local fisherman in the Crash Boat beach area.  He will take divers on two dive boat trips ($30 including tanks, not guided) to an area in Aguadilla where he goes fishing.  Sounds like an unexploited dive site, I will check it out next time I visit PR.