I would like to find out the price of an app that I have already purchased, so that I can suggest it to a friend. When I look at the app listing, it doesn't give the price if I already have it.
You can search it on the website of Google Play Store
In the play store app swipe form the left then go to Account and tap on ORDER History.
As user acejavelin stated either incognito or logout of google account. Which is what I suspected.