How much does this cost to the nearest dollar?

Acratech GP-SS Ballhead with Lever Clamp, 25 lbs Load Capacity
The Acratech GP-ss Ballhead With Lever Clamp has the ability to function as a gimbal head and as a panoramic head, providing you with incredible positioning flexibility and stability for your equipment. Gimbal heads are desirable when shooting with telephoto lenses, especially when following moving objects. Rather than a rubber knob, this model features a locking lever for securing the Arca Swiss-style clamp that constitutes the quick-release element. The GP-ss Ballhead is designed with a small diameter base of 2.08 to allow it to be used with travel-type tripods where the legs fold around the tripod head. The smaller base diameter allows the tripod legs to fold more compactly. Even when using your tripod

Price is $547.00
Price: $546.91