I have 2 days to buy an app off the playstore

I use Google Opinion Rewards, but I rarely buy apps off the playstore. I currently have about $16 in my google wallet, and I just realized at least a portion of it is expiring on July 1. So I'm looking for suggestions! What, in your opinion, would be a good way to spend that money before it disappears? It doesn't have to be apps or games, anything that will accept my google wallet as payment will work!