Sold and shipped by Amazon. The lowest price for this, that I know of, was at a penny lower in July, although that was sold by a different seller.
This knife sharpener gets pretty good reviews. However, there is a learning curve and it is recommended that one learn on cheap knives to start.
The Chef's Choice Trizor [amazon.com]
is generally comparable (if a 15 degree bevel is the target) in price and reviews and has a much lower learning curve, but is a bit less flexible overall (ie. tool sharpening or freehand sharpening.) At the moment it is more expensive though.