How much does this cost to the nearest dollar?

Upgraded Replacement Battery Compatible with Ryobi 14.4V Battery HP1441 Battery Cordless Power Tools
Brand New|Battery Type Ni-Mh|Battery Voltage Capacity Replacement battery for all Ryobi 14.4V cordless tools, fully compatible with etc. Upgraded to make your power tools more powerful Products are CE, RoHS certified, tested to match or exceed specifications of OEM Ryobi 14.4V power tools and original battery charger Professional. Manufacturer Reoben, Weight 1.46 pounds, Dimensions 4.76 x 4.69 x 3.82 inches, Country of Origin China, Batteries 1 Lithium Ion batteries required. (included), Is Discontinued No, Material Plastic,Metal, Voltage 18 Volts, Quantity 

Price is $21.00

Price: $20.99