Starting today (march 12nd), Sorrisi & Canzoni (italian weekly newspaper) brings a special edition CDs:

Greatest Hits
Greatest Hits II
Greatest Hits III
FM The very best solo collection.

The price is 9,90€ for each CD and with the first CD there's a special box to preserve the complete collection.

Check it out
http://www.sorrisi.com/sorrisi/personaggi/art023001035991.jsp