Where did you stay? Hotels are super expensive... $200+ a night range. Anything on the reasonable side?
Been there the past 5 years in a row and going again this year. Spend the extra money and get a hotel that is the the Montreal Metro (subway) area. Get to Montreal on Friday and purchase the weekend Metro pass $15 and you have unlimited rides on the Metro all weekend. Its perfect to get around town and to the track.
Here's a link to the Metro map: