If you catch a regular taxi from outside Phuket Airport to Khao Lak it will cost 1500 baht. If you book through Boss of Cheaper than Hotels Taxis based in Khao Lak it will cost 1000 baht, Contact Boss on firstname.lastname@example.org He will also quote for Transfer from Khao Lak to ferry for KKK
for further information. The price to KKK ferry isn't quoted but I would expect 500 - 750 baht.
Boss will quote you for your return trips also.