How much does this cost to the nearest dollar?

VINTRONS CS540, C054, Battery Replacement Compatible for Plantronics CS540 Wireless Headset, (Pack of 6)
Compatible For Plantronics CS540, C054 Wireless Headset; Replace For Plantronics Battery Part Number Voltage 3.7V; Capacity Type Li-Polymer; Dimension (around) 22.00 x 14.50 x VINTRONS Brand High Quality Plantronics CS540, C054 Replacement Battery. Dimensions 6.46 x 3.23 x 0.55 inches, Weight 2.39 ounces, model number Plantronics CS540, C054, Batteries 1 Lithium Polymer batteries required. (included), Rank Cell Phones & Accessories Cell Phone Replacement Batteries 2727, Available September 

Price is $81.00

Price: $80.99