Translation:How do you spend your afternoons?
No, it's used to refer to spending/passing your time. Of course, you could spend it shopping, but there's nothing in the verb itself to indicate that.
Your sentence is easily understandable, but you want either "brukes" or "bli brukt" as the verb, and you can replace "som i å" with "om". Short and sweet. :)
Kan "tilbringer" brukes om å kjøpe ting med penger?