How much does this cost to the nearest dollar?

Freestyle Comfort 16 Cell Battery
The CAIRE Freestyle Comfort Large 16 Cell Rechargeable Battery provides up to 8 hours of battery life at a flow setting of 2 when fully charged. It averages about 6 hours to charge the lithium-ion battery from 0% to 100% and is an ideal power source when you need extra battery life for extended flights or long road trips. The FreeStyle Comfort recharges the battery pack when it is installed in the concentrator and is connected to an external AC or DC power source. It is lightweight at only 3.1 pounds and measures 7.3 inches wide x 3.1 inches deep x 2 inches high. It’s easy to carry multiple batteries in the accessory bag or a backpack, making it easy

Price is $500.00

Price: $499.99