Whats available in Roatan:
BIBR has sorb (most of the time) and has O2 (95%) up to 2000 psi. AKR has tanks but you need to bring your own whip, psi will be what ever. BIBR did not have much by way of tanks to rent, but AKR had many sizes, but only onesy - twosies. Diving a Dolphin is fairly easy at most places, but if you want 95% (high as it goes there) you have to go to BIBR or AKR.
I am still waiting for a price for renting sorb, and its been a couple months.
BIBR does rebreather (prism) training several times a year and at that time you could probably expect more supplies to be available.
Finally, Continental does not allow compressed air cylinders period (according to their P&P online).
For me, I have to leave my brand new in the box Inspiration at home as I decided it was just too much of a pain. So its back to a BP/W and noisy bubbles. Next time we are going to an RB friendly place...... Palau.