The Supermarket's Birthday

Well apparently it is my supermarket's birthday. As part of the party, there were games - well special offers, which for me became a game.
I didn't realise it was the supermarket's birthday so it was the last week of it's celebration, I had not used any of the birthday coupons, cheerfully referred to as presents. They don't let you use more than one at once so it was the big decision which to use with today's grocery shop.
The two I most liked was the instant $5 off your bill or the win your whole shop free. What should I do? Take the $5 - that would be half the bottle of the tasty Riesling that was on special or go for it all for free.
I thought about it all around the supermarket, down the aisles with the staple food items and especially down the aisles with the biscuits and the chocolates and the ice cream. If I won this shop for free, it would be so worth putting in a few bars of chocolate....
I got to the counter.
I still had not decided.
"Do I give you this coupon now?"
"At the end," the checkout chick said.
I still had time to decide.
I watched the items be scanned. This was adding up fast.
It was an expensive shop. Would $5 off be worth it or should I gamble it on a total freebie?
The last item scanned and she looked at me.
I looked at the total.
It was a birthday, it should have games.
I played the game.
I gave the win a free shop coupon.
It was the supermarket's birthday so it won. I paid for the shopping and pretended to be happy about it.