How much does this cost to the nearest dollar?

Aqua Fresh Refrigerator Water Filter Replacement Compatible with Replacement for 9915, Filter 6, (1 Pack)
EASY TO FIT Designed to fit the original. Easy for installation and operation. No tools required. AFFORDABLE OPTION Costs less than OEM filters without compromising any quality or flow rate CERTIFIED QUALITY All Aquafresh Filters are tested and certified by IAPMO to NSF Standard 42 for Structural Integrity, Materials Safety, Chlorine taste, odor reduction and System performance. Quality you can taste! HIGH EFFICIENCY FILTRATION Activated carbon blocks certified to ensure contaminant reduction for 200 Gallons Or 6 Months, depending On Water Usage And Quality Comparable to the Whirlpool Aquafresh WF293, and Water Sentinel WSW-2 Brand Name Aqua Fresh

Price is $21.00
Price: $20.99