Strict rule of retail: Pound your customers with promotions on any three day holiday. Look it up. We have President's Day, Memorial Day, July 4th, Labor Day (seems ironic), Columbus Day and Veterans Day. Car dealers are notorious for the best sale of the year on that particular weekend.
So are appliance stores. I am still on vacation, but I am willing to bet there are 20% off sales at Sears, Best Buy, Lowe's and HD. They are smart. However, this great promotion is generated by rebates.
Have a look at these packages before and after rebates from September 1-6...
Bosch: $2999 to $3199 after Labor Day
Frigidaire (oddly enough their rebates start at 20% off): $1999 to $2399 after Labor Day
GE: $2499 to $2999 after Labor Day