Do you keep track of all the things you buy in case price goes down so that you can complain to customer support when they do? In my case, I contacted support

Do you keep track of all the things you buy in case price goes down so that you can complain to customer support when they do? In my case, I contacted support to see if I could get a discount before making the purchase and they told me to wait two weeks for an upcoming promotion. Also quickly exchanged a defect mattress. Not saying they're the best, but complaining because they don't have retroactive sales....