Just wanted to share an email I received from Walks of Italy - they are offering 20% off different tours each day until Feb 6. For any date in 2016 (obviously you have to book the date)
Check their Facebook page or website for the daily code.
Offer ends tonight. See below for updates...
Looks like everyday will be one different tour offered. You can follow them on facebook/twitter/instagram to see the special and get the code. But they don't give you long to decide! But if you know you wanted to book one for a certain day, good chance to save some euros! Says there will also be discounts on tours in Florence, Venice and Vatican City...I can posts updates every day on which are on sale if anyone cares - or just check it out yourself!