If your current machine still works
Use the time to measure, compare models and obtain installation quotes. Record the actual price for the same model over several shopping visits. A claimed percentage discount is less informative than the final price you have already observed.
Major retail promotions and range changes can be occasions to compare offers, but no month guarantees the lowest price. A cheaper appliance is not a saving if the installation window conflicts with a kitchen renovation or the seller cannot support delivery to your address.
If replacement is urgent
Prioritise verified stock, a clear delivery date and compatible installation. Ask what happens if the delivered appliance is damaged or does not match the order. A few days of hand washing may be worthwhile if it avoids accepting the wrong format, but household circumstances differ.
Do not keep operating a dishwasher with an unresolved leak or electrical concern just to wait for a promotion. Arrange appropriate service and discuss whether repair is practical before planning around a future sale.
Treat clearance as a separate decision
A superseded model can be useful when its features suit you and the warranty and service arrangements are clear. Confirm whether it is new boxed stock, an open-box return or a floor display; those are not equivalent conditions.
Compare the old and new specification sheets. The newer Bosch 500 SHP65DM5N and older SHP65CM5N illustrate why a family name is insufficient: rack and wash-system details differ. A newer model is not automatically better for every buyer.
Use a simple purchase trigger
Decide in advance which model, installed price, delivery window and return terms you will accept. This turns an endless sale search into a practical decision and reduces pressure to buy a feature package you did not need.