What shoes are good for working in wet conditions?

In the summer I do landscaping cutting grass, and we start early. The grass is still wet a lot of the time from the moisture at night, or from rain or anything else, and my feet get soaked in regular shoes after only a couple lawns. I was wondering what shoes are a good choice for wet conditions so my feet don't get wet, and also comfortable for the amount of walking I'll do. Something inexpensive wouldn't hurt either!