treat yourself to something in Polish:

1. zafundować sobie coś

Polish word "treat yourself to something"(zafundować sobie coś) occurs in sets:

Shopping, types of shops and at the checkout
Longman Repetytorium Maturalne, Unit 6
MATURA FOCUS 4- THE COST OF LIVING
t h e c o s t o f l i v i n g
żywność(matura rozszerzona) II