How much does this cost to the nearest dollar?

Tier1 Humidifier Filter Replacement for Aprilaire Water Panel 35 Models 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768, Honeywell HC26P, HC26
Designed to Fit Fits Aprilaire humidifier models 350, 360, 560, 560A, 568, 600, 600A, 600M, 700, 700A, 700M, 760, 760A, 768, Honeywell HC26P, HC26 Actual Size 10 inches (height) x 13 inches (width) x 1-1/2 inches

Price is $51.00
Price: $50.59