Yes and no. The prices are increased about 1 month in advance. With that the average price of the last 4 weeks is increased and then you have your rebate, which is legal.
The discount must be referenced on the LOWEST price 30 days prior to a sale, not the average.
It’s the lowest that count, not the average. Otherwise you could just put all items at $100k for one hour every night to put the average very high.