My wife and I are travelling to Venice for the first time in March, and we intend to do the Doge's Palace Secret Itineraries tour and the Clock Tower tour. We also plan on getting the Rolling Venice card (we are both under 29), which would save us €22 combined for the two tours. My problem is that the Rolling Venice card cannot be purchased in advance since it requires proof of age.
Is it possible to purchase tickets for these tours upon our arrival in Venice, after we have our Rolling Venice cards? And considering we will be in Venice in early March, is it likely that there will still be tickets available when we get there?