Sounds a bit of a faff. I’ve probably stopped some impulse buys - I’m afraid to say I’m a lazy & easily distracted shopper 
Yes I got a bargain but it wasn’t on Friday it was today and it wasn’t to my knowledge in a sale- it was a ring made from an old spoon and I love it.
I got it from a Christmas fair a friend and I go to each year. It’s in a tiny little village hall that was absolutely heaving with people and Christmassy stuff.