Winter is also the time when bike shops hold end-of-the year sales, where good deals can be found if you are in the market for a new bike. And for those manufacturers whose models do not change year to year, winter is often the last chance to get a bike at the current price tag, before prices go up in the Spring. If you hang around long enough, you might also learn about non-advertised deals, including second hand bikes. Some of the most interesting vintage bicycles never make it to the likes of Craig's List or e-bay, but are sold via word of mouth. Bicycle shops can act as hubs for those types of connections. If you are looking for a particular bike, try asking your bike shop about it - they might just know of a customer, or a friend, who is trying to sell theirs.
The winter months are infamously slow for the bicycle industry - but as a customer, you can take advantage of that in a way that benefits everyone: You get more personal attention, faster turn-around, and better deals - and the bike shop gets winter business. It's win-win!