Appliance rebates are arbritrary, but holidays seem to have more than any other time of the year. As I have posted many times, rebates can save you a small fortune.
The secret is timing...
Take Electrolux for example from July 1-5, they have rebates of over 20% on any of their refrigerators (except their Icon label).
This refrigerator is $700 less expensive than it will be on July 5th.