In 1999 the U.S. Mint produced 5,500 Sacagawea Dollars and distributed them to General Mills for an agreed promotion. In the promotion, General Mills would place 5,500 Sacagawea Dollars inside every 2,000th box of Cheerios. In 2005, collector Tom DeLorey discovered that some of these 5,500 Sacagawea Dollars had a different detailed design on the reverse of the coin. This different design had detailed veins in the eagles' tail feathers. Uncirculated and including Proof coins lacked these fine details on the eagles feathers.

After the initial discovery, the hunt was on and collectors all over the country began searching to see if they had this scarce design, referred to as the, "Cheerios Dollars." After several years only a few hundred examples have been found. Who knows how many are still out there waiting to be found, but finding one would definitely be an incredible find.