Redfin.com and realtor.com give you this information in the U.S. (I think sometimes Zillow can provide info too.) How much you can see seems to depend on location -- in Boston Redfin.com gives a ton of useful info, including price reductions, time on market and so on. Realtor.com also sometimes provides this (though sometimes you kind of have to dig). In the midwestern state I live in now, Redfin does not provide as much info, at least not in the straightforward way they did in Boston.
In Canada, though -- I don't know!