Flying Club Co-operating with Sky Aviation
Yes, it is expensive as plane need to re-position from Lombok to Bali. Also AVGas in Indonesia is very expensive at USD12/US Gal in that area. It is three times more than US.
The cheapest way is for you to take a local flight to Lombok and join them at the airport. Ticket (return) to Lombok is like USD100. Then you can take their standard tour.
Also, Sky Aviation is now co-operating with Indonesia Flying Club to provide flight for pilots (local or overseas). Only thing is you need to be a member of the Flying Club which is easy by paying an annual fee (small amount) and get flying. Charge is like USD350/hr including an instructor and you can take the control depending on how good you can fly. They may need you to fly a minimum hour each time and pay more for multiple landings. Nothing is free except in US.