What can I do with 0.30 euro Google Play Balance?

So I recently bought a 15 euro google play map, so I bought some articles (including Minecraft) and now I have 0.30 euro left. I do not know what to do with it or can at all, so I ask for ideas

Buy you a game for 30 cents

You can get something for a few euro if you have a paypal bank or paysafe account linked

Gives special offers in the playstore.

So I've already got some useful apps for little money.