Here's a $5 game that qualifies since the list price is at $19.99. Enjoy!

Edit: Here's a legitimately good PS4 game for $10 that qualifies, too.

Edit2: A LOT of games are on sale for E3 at the moment. Just go to the Video Games section on Amazon and click the $10 an under button and there's a good few games for next to nothing that have a list price of $19.99 and qualify.