Prices vary, simply select the pillow size to see the price. For optimal fullness, choose an insert 2 inches bigger than your pillow cover. Example, you'll need a 20"x20" pillow insert for a 18"x18" pillow cover. This rule excludes lumbar pillow covers, they come true to size and fit snugly in our covers. If you'd like us to include your insert into your pillow cover, simply include your request in the "add note" section on the "Cart" page.