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Buying items on sale even when not needed is an example of spending money irrationally.
To celebrate the holiday season, the toy store has a wide selection of toys on sale.
I wanted to buy the last item on sale, and I was in luck, it was still available when I got there.
The electronics store is having a clearance, and many items are on sale for half their regular price.
The family lived thriftily, shopping for groceries on sale and avoiding unnecessary expenses.