Thought such premium product should be fix at the same price world wide.
Every product whether premium or not still subject to transport/inventory costs depending on country, GST/VAT depending on country, tariffs and taxation depending on country, exchange rate depending on country
Even physical foreign currency cash itself if you want to 'buy' also wont have a fixed universal rate that everyone abide by. If u dont believe ,try and change some SGD to USD from lucky plaza or raffles city Arcade money changer, then go to changi airport money changer and try to change the same amount of SGD and see if u can receive the same amount of USD in both places.
Dont even need to see different country, the same can of coca cola can cost different here depending if you buy it at kopitiam or at the top of the skydeck bar at MBS