Through this tool, you can check the price of Steam games in 9 countries or regions. Countries include: United States, United Kingdom, European Union, Brazil, Turkey, Argentina, Mexico, Japan, Canada. You can even use this tool to check the price of game bundles. You need to copy the Url of the game on Steam into the input box below. Example:
https://store.steampowered.com/app/252490/Rust/
https://store.steampowered.com/bundle/12976/Rust__DLC_Bundle/
https://store.steampowered.com/sub/951709/