Novartis, the company that manufactures Excedrin voluntarily recalled the product in December because bottles made at their Lincoln, Nebraska plant may have been contaminated with powerful prescription drugs made at the same factory.
Immediately after the recall, bottles began selling online at sites such as Ebay for as much as $100 a bottle. Since Novartis has still not restocked product, the scarcity of the remaining bottles has skyrocketed to over $300 on the secondary market for bottles containing 100 pills. The retail price of Excedrin for 100 count bottles was $6 before the shortage.
Apparently this stuff works- current Ebay search link here