Unless you actually needed to buy it to survive, then you've saved money as you were intending on buying it anyways regardless of whether or not it was on special.
When a store wants to get rid of something the first thing they do is jack up the price by like 50% for a day or so and then have a 25% off sale. When that sale ends they drop the price to actually cheap and stop advertising the sale so people will buy the expensive products instead.
What's money for if you don't buy things