Earlier this year, singer and cookbook author Patti LaBelle teamed up with Wal-Mart to make a sweet potato pie.
It costs $3.48, it's got her face on the box, and sales were just OK when it came out in September.
But today, it's a scarcity. The pies have sold out in many Wal-Mart stores and are going for up to $40 on eBay. (We found this Craigslist listing selling slices for $10 each in Washington, D.C.)