Agree with the previous comments about prices and there never seems to be any change so cashiers offer little sweetie bars/packets instead!!
One tip if you haven't visited Turkey before is that you need a tourist Visa which until recently had to be purchased on arrival, cost £10. However you can now obtain visas online - I think mine cost around £12.50 - which saves loads of time, try this link
https://www.evisa.gov.tr/en. Validity I think is either. 3 or 6 months.
Hope that helps