How much does this cost to the nearest dollar?

Drymistat Humidifier Tube - 3 Pack
Prepare the DryMistat for First Time Use Step 1 Some water evaporation may have occurred while DryMistat was sitting on the store shelf. Step 2 Break perforated safety seal on caps. Remove solid cap from tube and discard it. Step 3 Install the perforated Cap on the Tube. Step 4 While holding the tube vertically, tap it on a hard surface to force the crystals downward. Step 5 If the crystals are above the ‘Fill Line’ start using it right away. (If below, follow Refilling instructions) Is Discontinued No, Dimensions 6.18 x 2.28 x 0.87 inches; 4.02 Ounces, model number Available November 

Price is $21.00
Price: $21.34