How much does this cost to the nearest dollar?

Waterdrop Plus NSF 401 Refrigerator Water Filter and Air Filter, Reduce PFOA & PFOS, Replacement for LG® and 2 Combo
Replacement for Water Filter Models LG Kenmore 9980, PF16, CF16, CLT-2, Authoritative Certifications Dedicated to providing pure and healthy drinking water, Waterdrop, a world-famous water purification brand, has been trusted by over 6 million American families. Waterdrop's high-quality replacement filters, from every component to the whole filter, have been certified by NSF and IAPMO against NSF/ANSI 401, 53, 42 and 372 standards for effective reduction of 35 substances, ensuring high-quality drinking water. Comprehensive Certifications This filter has been strictly certified against NSF/ANSI 

Price is $21.00
Price: $21.39