You can buy stamps (francobolli) in tobacco shops or in post offices. They are usually open from 8.30am to 2pm from Monday to Friday and from 8.30am to 12pm on Saturday. Main post offices are also open during afternoon.
For shipping packages abroad, use Mail
Boxes Etc for the best rates. Go to their central location in Rome:
Via Barberini, 3/A (Phone: 39-06-4287-4288.) Or, visit the website: www.mbe.it
To view a list of the MBE Via Barberini office's services in English, click
here: Services
The central post office is located in Piazza San Silvestro.