how to get a url to an app on iTunes

Open iTunes and navigate to your app page, right click on the icon on top of the page and click "Copy iTunes Store URL".

 

http://itunes.com/app/AppName or http://linktoapp.com/AppName

For example, http://itunes.com/app/Equivalence or http://linktoapp.com/Equivalence

 

No need to even launch iTunes, this webpage lets you search by App name and it gives you the iTunes URL:

http://appsto.com/pages/itunesurl