Gondola rides are offered at a fixed cost set by the city government, though experienced travelers will tell you that many gondoliers do not always adhere to these costs. That's why it can be necessary to negotiate the price and length of ride before you board the gondola. Don't expect the ride to be cheap, especially during peak tourist season when the demand is great. In addition, rates are higher after a certain hour of the day, so a nighttime ride will be more expensive.
Gondola stands are located throughout the city. Some trips include a jaunt down the Grand Canal while others paddle along the quieter side canals. Often, you can book a ride through a travel agent or the concierge at your hotel, which means you won't need to haggle about the price.