hi there we got back 2 weeks ago from Manado, where we did a weeks live onboard with Murex - I think we got a good deal about S$1300 including air tickets from Singapore, transport to the resort (40mins drive), the boat with a crew of 8 (12 divers), 6 days diving 22 dives (on air, nitrox is available only for land based holidays), food for most meals (all on the boat).
At the airport we saw many people from Froggies another resort there (search in google for froggies divers - that should find it)
I'm looking at going to Sipadian in September, where did you stay? what were the dives like? deep or shallow? do they restrict your depth? did you visit the Turtle Cave?
Any answers would be a great help.