Is it better to buy electronic goods in the U.S., before or after Christmas?

Suppose you are purchasing: (1) desktop (2) Car GPS – moderate or high end (3) laptops. Would you buy before or after Christmas to find the lowest price? It appears that There are many sites advertising the lower prices, although it is difficult to compare prices, as they often are "extras" or cost more or saving more. I have no hurry, except to save money.

check out newegg.com ubid.com or swear I just got an impressive notebook for $ 200

Tibia Hack Gps 8.54

Garmin StreetPilot III Car GPS Receiver, Many extras!! $26.00

GARMIN NUVI GPS 350 W/MANY EXTRAS ITEM MINT CONDITION $11.50