Agree.Especially, for home theatre euipment, you may want do some research first, before you go out to buy the cheapest on the market.
In terms of of Boxing day, it is not always that great. Plus, you have to wait in line on that day. Most of store will start their mark down on Christmas eve (usually the afternoon after 2:00 pm), that way on Dec. 26 the store is ready for business. If you have time on Dec. 24 and are interested to buy something, you should go then. Not recommending shopping on Boxing day, it is crazy that day.