Up here in most of Canada there is a 6 month cycling season which means bike shops generally try to stock up for March to August sales. Except for the odd sale hardly anything moves off the floor Oct to March and the LBS's rarely bring in stuff because they don't want to carry the cost of a bike that won't sell until there is warm weather.
But what happens in year round warm places like California? Is there a constant turn-over? Does new stuff come in throughout the year or do they also operate on a 'season'?