How much does this cost to the nearest dollar?

Plastic ESD Clamshell Case for 3.5 Internal Hard Drives (3.5 10 Pack)
Made with high-grade ESD plastic for anti-static protection. For bare 2.5 internal hard drives or drives with anti-static bags. Internal Dimensions 6 x 4 x 1 | External Dimensions 7.25 x 5.25 x 1.5 Clamshells are stackable when in use. Includes 10 ESD clamshells for 3.5 internal hard drives. Dimensions 7.25 x 5.25 x 1.5 inches, Weight 10.4 ounces, Manufacturer Silicon Forensics, model number Rank Computer Hard Drive Bags & Cases 1000, Available May 7, 2019

Price is $21.00
Price: $20.99