I've done this before an was honored a discount on online orders.
It doesn't hurt to call the company and make them aware of your previous purchase and now the new pricing (sale). If your purchase was made recent before the sale it is possible to get a discount/credit on your credit card.
But like MHT962 said, it totally depends on the merchant.
blackfoot (rep: 557k) posted Apr 25, 2011
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