There are the prices for a private transfer from Izmir to Altinkum/Akbuk:

1 - 2 people     :   £50
3 people          :   £55
4 people          :   £60
5 - 7 people     :   £80
8 - 11 people   :   £90
12 - 14 people :   £110

Prices are one way only.