To ask the price of one thing:
Quanto è...?
Quanto costa...?
 
To ask the price of more than one thing:
Quanto sono...?
Quanto costano...?
 
What the shopkeeper might say:
“What would you like?”:
Prego?
Cosa voleva?
Dica!
Desidera?
 
“Anything else?”:
Altro?
Basta così?                        (literally: is that enough?)
Va bene così?                       
 
“Here you are...” - Ecco...
 
You might say:
Mi dà.....                        Give me....
Avete...?                        Do you have...?
Vorrei....                        I would like...
Prendo...                        I would like...
 
Mi piace                        I like it
Mi piacciono                        I like them
 
“How much does it come to?”
Quant’è?
Quanto viene?
 _
una cartolina                    a postcard
i francobolli                      stamps
un biglietto                       a ticket
una mappa                       a map
una piantina                     a city map
una guida                         a guidebook
in tutto                              all together, in all
di resto, il resto             change
è chiuso                         it’s closed
È chiuso?                        Are you closed?  Is it closed?
È aperto?                        Are you open?  Is it open?