MoonWrasse
Contributor
Marina divers in Phuket is offering a deal of $1 a night accommodation while you take a course. Although it's low season in Phuket, you might consider it. I'm sure there's still a lot of good diving although the Similans are closed til November.
http://www.marinadivers.com/phuket_marina_divers_dive_trips.html
http://www.marinadivers.com/phuket_marina_divers_dive_trips.html