Each kit includes Reese's Chocolatey Bread, Reese's Peanut Butter, strawberry jam or grape jelly, and new Reese's PB&J Big Cups. They were priced at $19.99 (plus shipping) and sold on the Hershey's online store.
According to the fine print, "Due to the limited number produced, a maximum quantity of 3 grape PB&J sandwich kits may be purchased per customer." That sounds like each person could buy a total of six kits (three strawberry kits and three grape kits), which seems like a big cap for a limited quantity (then again, these type of things tend to sell out quickly regardless).
The sandwich kits came about following an April Fools' Day prank where Reese's teased that it was getting into the sandwich business with the launch of Reese's Chocolatey Bread.
Photo via Reese's.