How much does this cost to the nearest dollar?

Diamond Machining Technology (DMT) 4-in. Portable Diamond Whetstone Bench Stone, Extra Extra Coarse Grit Sharpener (W4XX)
DMT (Diamond Machining Technology) 4 Diamond Whetstone Bench Stone, Extra Extra Coarse Grit Sharpener One Size Crafted from the highest quality materials Built for performance and durability Made in United States Leather sheath provides each access and portability Extra Fine diamond for the finest polished edge of al bonded diamond abrasives Manufacturer Diamond Machine Technology (DMT), Part W4XX, Weight 5.6 Ounces, Dimensions 11 x 6 x 4.25 inches, Country of Origin USA, model number W4XX, Size One Size, Style Extra Extra Coarse, Material Synthetic, Quantity 

Price is $21.00
Price: $20.59