A public boat to Bangsal costs 8,000 rupiah per person and departs when there are 20 passengers. To charter a boat costs 155,000 rupiah.
To/from Gili Meno
A public boat to Gili Meno leaves at 08:30 and 15:00 and costs 20,000 rupiah per person. The return service leaves Gili Meno at 09:50 and 16:20. To charter a boat to Gili Meno costs 220,000 rupiah one way. Note in the reverse it costs 180,000 rupiah from Gili Meno.
To/from Gili Trawangan
A public boat to Gili Trawangan leaves at 08:30 and 15:00 and costs 23,000 rupiah per person. The return service leaves Gili Meno at 09:30 and 16:00. To charter a boat to Gili Trawangan costs 250,000 rupiah one way.
Like Trawangan and Meno, there is no motorised transport on Gili Air. Your only options are horse-power and people-power.
As with the other islands, the pricing of the cidomo or horse carts are somewhat removed from reality — expect to be charged 50,000 rupiah for even a shortish jaunt and always confirm the price before getting going.
A much better option is to hire a bicycle. They generally go for 30,000 rupiah per day.
Lastly, Gili Air isn't a big island and unless you have loads of bags or kids, or you are staying at the far tip of the island, you should be able to walk to wherever you are staying.