In Houston, many of the bigger bike shops have big sales the last week of August and the first week of September. One "big volume" chain store is a bike store in the summer, but is a SKI store come November. So, any bikes left in October are sold for something like wholesale prices.
And, if a 2005 model bike happens to be sitting around in January 2006, most bike stores will take "any reasonable offer" to get rid of it.
But, of course, if you see the bike of your dreams in June, and you are hoping it will still be at the store the first week of September, in YOUR size, and in your favorite color...well, good luck with that.