different between price in Avast website and in the app

Hello everyone, I found something really strange, at least for me, that is the price to buy avast products is different between in Avast website and in the Avast app on my computer. For example, Avast SecureLine VPN on Avast website costs 59.88$ for 1 year, but in the Avast SecureLine VPN app that can be downloaded free, it only costs 35.88$ for 1 year.
Can anyone explain why it is for me?
Thank you, everyone.

Most probably a discount.