I'm going to Ottawa for charity work for Canada150 and all the hotel rooms are gone. Our host has a block of room I have access to for $700/night minimum two nights.

For the Grey Cup week we have booked a suite at the Novotel next to the Weston Hotel - Grey Cup HQ. We're paying $300. All the hotels have rooms too with exception to CFL HQ. Travelocity shows room between $150 upwards depending on distance and quality. If I were younger or more flexible, I'd look at some of the nice looking B&Bs. They're less than $100.