Hi theresa, I'm new on this site also and by chance I read your message. Well I know just the place in Florence. Don't know if you have had any replies but this you should check out.
It is called la bottega dell bonfresco. It has it own website you can check out. I'll look the adress later. You're contact is marco, all in english is possible.If you learned any other adresses in Italy
I'm interested to learn them. send them to me please elswijkvan@zeeland.nl
Okay here is the adress www.bottegadelbonfresco.it
Via Ser Ventura Monachi 23AR
50125 Firenze Tel-Fax : 055-6810853