On Dalaman Hight Street there is a company called "AS CAR" they charge £20 per day all inclusive and will meet you at the airport. They accept payment in £s, are very helpful and reliable.

Regards
Martin

The last few times we've been to Turkey, we've hired from Pandora Car Rentals who are based just outside of the airport. Their cars are fully insured with no excess and you can pay in cash on arrival. They have been highly reliable and last week when we decided to go at the last minute to Turkey for the Bank Holiday were able to supply a car with 8 hours notice to be collected at 4.00am! Great service. The cost was £20 per day.

http://www.dalamancarrental.com/

I can recommend for you a really good company https://www.dlmcarrental.com