Here's something I learned on this awesome forum.

Not sure if you will be stopping on Tortola anywhere, but Last Stop Sports has scuba gear and lots of toys that they rent. I think their rates are great. We are using them for a bunch of gear in April. Many dive shops here and there to refill tanks. If you rent 6 tanks, they will even supply a rack for the boat.

They are at www.laststopsports.com

Not sure if you will be somewhere they will deliver to, but it may be worth dropping them a quick note. They deliver to many marinas on Tortola. I don't know if they will deliver out to Scrub or not. Heden is the guy I dealt with. Very pleasant!

By the way, I am not associated with them in any capacity except that I found them on this forum and they are providing us gear in a few weeks.