Ahh you should've posted this a few months earlier. I know a BBV had one for the longest time (it's a Forza bundle), but it's not there anymore. The TRU on Broadway had a couple for about $100, but that's probably gone as well.
Zellers is a good bet as well: I remember N64 games at one location for $2.
Does EB Games even sell used ones anymore? Maybe you can find a cheap one in the local wanted ads, like if a poor kid is trying to get a 360 or something