Venice does not have any cars or buses, everything is transported by boats
It sounds a bit odd initially but then how cool it is to not have the pollution because of cars or buses. People get accustomed to it over time and boat riding is always enjoyable and soothing. I have always heard Venice or in general Italy is very expensive, but you feel, that's not true ?
Expensive or Cheap is relative.
There are inexpensive options to explore when traveling to Venice. Lots of students do it on budget. They stay outside the city and take a train to the island and stay for the day. The island is small and totally pedestrian.