This app was mentioned in 2 comments, with an average of 2.00 upvotes
Raise.
Its completely changed how I shop. I open up Raise, look for any gift cards that allow me to use in store, buy it for a couple dollars off($75 Best Buy card for $71 as an example), and use it in store. Better yet you get 5 dollars for signing up with my code ccoachman. It's more reliable than Gyft IMO.
Link me: Raise
EDIT: Bot isnt working. Here is the Correct link
https://play.google.com/store/apps/details?id=com.raise.andraise
Sell it. There are multiple websites where you can sell gift cards. Raise is a popular one.
https://play.google.com/store/apps/details?id=com.raise.andraise&hl=en