I am currently trying to find out the same information. I have been looking online and the prices are all so varied £30-£100. My friend booked a boat while he was there a few months ago and got it super cheap.
Best bet is to purchase on arrival to Bali, heaps cheaper we paid $60 AUD return from Bali to Gilli T, we used Semaya One, I would not suggest you use these guys as we didn't find the trip very comfortable at all, no air conditioner and very crowded.. But I haven't used any one else so not sure.. Good Luck
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