Could you give me some information?
po-TREB-be — three syllables; the double 'b' is a geminate; stress on the second. 'Potrebbe' is the formal conditional of potere.
Use this to preface any question at the tabaccheria counter. It's a polite opener that signals you need help, not just a product, and invites the shopkeeper to give you their full attention.
'Potrebbe' is the conditional of potere (to be able to), used here as a formal polite request. 'Un'informazione' is the singular — in Italian you say 'an information' where English uses the uncountable 'some information'. This opener works for any type of question.
Mi scusi, posso chiederle una cosa?
Excuse me, may I ask you something?
Even softer phrasing — useful when the shopkeeper is busy
Sa dirmi dov'è...?
Could you tell me where...?
Specifically asking for directions or location information
Ha un momento?
Do you have a moment?
Checking availability before launching into a question
Italian tobacconists are informal community information centres. Because they are open early and late, know the neighbourhood intimately, and see hundreds of people daily, they are excellent sources of local knowledge. Asking a tobacconist for directions, recommendations, or local news is entirely normal and often yields useful results.