Shaykh Abdul-Muhsin Al-Abbaad was asked:
Is it allowed for the owner of a merchandise to change the price according to the place, season, and buyers?
Yes [it is allowed] if the merchandise has a price in a place and it has another price somewhere else. It is well known that a merchandise can be found in a place where the price is low and in a place where the price is more. So how can the merchandise be moved from one place to the other? Likewise, the seasons where there is a lot of demand and little supply. No doubt that differs according to the difference in the place and time”.
[Sharh Ibn Majah no. 159]
Faisal Ibn Abdul Qaadir Ibn Hassan