Monitor http://www.androidpolice.com/feed/ for the 'temporarily free' keyword and push a notification to your registered IFTTT device(s) when a new RSS entry is published.
If
New feed item matches
This Trigger fires every time a new item in the feed you specify contains a particular keyword or simple phrase.
Then
Send a rich notification from the IFTTT app
This action will send a rich notification to your devices from the IFTTT app. Rich notifications may include a title, image, and link that opens in a browser or installed app.
Explore more great ways to automate Notifications and RSS Feed