Vixen Lanthanum 17mm
This eyepiece is a great deal. People have compared the image quality to that of a Televue Nagler.
Lanthanum Superwides have a wide 65° apparent field of view opens up the cosmos. Sophisticated eight-element, multi-coated lens assembly provides a 20mm of eye relief—enough for eyeglass wearers to enjoy the full field of view. A Lanthanum lens element has been incorporated to provide superior image correction.
Price is $200 plus shipping ($7).
This one is in new condition includes caps.
New they are $235