alt text
three rows with a barbecue on the left and William Wallace in Braveheart on the right.
In the first row, captioned Wednesday, the barbecue is labelled "$899.99" and Wallace says "hold".
The second row, captioned Thursday, depicts the same.
In the third row, captioned Black Friday, the there is a label with ~~$1099.99~~ struck through with "$899.99" written underneath, and Wallace charges.
edit: grammar
It might actually work if the requirement was a year instead of 30 days.
Also mandate minimum font size for it and that it must be displayed along with the current price anywhere the current price appears.
I honestly think 1 year would be too far back to be actually relevant to the current price, but I can see a 3 month period being a good middle ground.