I think it has to be money laundering

https://archive.vn/g0l0F

"In late January, a third-party seller on Walmart listed a 4-pound box for $110. On Amazon and eBay, sellers jacked up prices of the high-fiber cereal that doesn't contain grapes or nuts but is made from wheat and barley.

The 64-ounce box has a suggested retail price of $6.49, with the 20.5-ounce box costing $4.29 and the 29-ounce box $4.99.

Cereal fans who paid $10 or more for a box of Grape-Nuts Original cereal between Nov. 1, 2020 and March 15 are “eligible to submit a valid retailer or e-retailer receipt for a partial refund of up to $115 to help cover the difference between the amount paid and the suggested retail price of the Grape-Nuts Original cereal box purchased.”