And I will highly recommend buying the Venice Connected Card online to get advantage of the online promotion and effectively get a cheaper rate if you plan properly. This is because the card is seasonally priced in the website.
Low/Middle season Most convenient Online price | Middle/High season Middle Online price | Top season Higher Online price | Full price |
It is of course of a flat rate if you bought it in Venice itself via the Venice Connected Point.
And whether you want to buy it on the spot or online, you will definitely have to make a trip down to Venice Connected Point to collect the card. One such Venice Connected Point can be found right outside the Venezia S. Lucia Train Station. As you step out of the train station, you will see many little booths selling tickets. Look towards your right for Venice Connected Point.
p/s: It is an irony though that they told me no queue but I ended up in a long queue on a rainy day.
Source:
http://europeforvisitors.com/venice/articles/vaporetto_routes2_table_printable.htm
http://www.veniceconnected.com/ecommerce/carrello.php?idcategoria=2