These boards are designed to be used behind a comic book in the Guardhouse Shield Current comic book bags (Item 668116 and 668158) and provide a sturdy backing that protects from accidental creases and folds.
The price of "Guardhouse Shield Current Comic Boards (100 count)" at Comic Book World Florence is USD $15.99.
"Guardhouse Shield Current Comic Boards (100 count)" falls under the category of Comic Supplies.