The sailing instructor at JASC, Pete Watt, might be able to let you know about avaliable boats there.

It is quite tricky getting hold of boats in this region. If you're after new stuff, Mike White of ULO marine in Abu Dhabi can help you out as ULO are the regional Hobie agents, but they are pretty damn expensive - 2,000 USD for a new set of sails for example...

Another option for 2nd hand boats is to approach the Cresent Moon or Dharan Sailing clubs in KSA. From the guys there, they have big fleets, but not many sailors, and the boats are generally in reasonable nick. You could probably get a recent-ish boat in good condition for 10,000 dirahms, which works out as only a bit more expensive than Mike's sails!

Our fleet in Bahrain is of 70 and 80s vintage, and I suspect my boat is older than me...