How much does it cost?
QUAN-to CO-sta — equal stress on both words; the 'qu' is /kw/ as in English 'quantity'.
Use this at any point when you want to know the price of an item. It is the most fundamental shopping phrase in Italian.
'Quanto' (how much) + 'costa' (third-person singular of costare = to cost). For multiple items use 'Quanto costano?' For a specific item you can point and say 'Quanto costa questo/questa?' (this one).
Quant'è in tutto?
How much is it all together?
Contraction of 'quanto è' — used when paying for multiple items
Quanto costano questi?
How much do these cost?
Plural 'costano' for multiple items
Ha qualcosa di meno costoso?
Do you have something less expensive?
Polite way to ask for a cheaper alternative
Italians are comfortable asking about prices directly and without embarrassment. Bargaining (contrattare) is generally not done in tabaccherie as prices are fixed, but asking before buying is completely normal and expected.