Looking to try binoviewing without spending the medium-to-big bucks for a new rig? Here is a pair of Siebert binoviewers purchased from Harry in 2000 and sent back for upgrades in 2002. They come with a set of 21mm Super Wide Angle eyepieces, a 1.8X Optical Correction System to allow them to come to focus on reflecting telescopes, and the standard caps and storage pouches.
These binos have caught a lot of flak for their aesthetics (or lack thereof), but they *do* feature 22mm clear apertures, a high quality dichroic beam splitter, and sliding diopter eyepiece adjustment that has been further refined with the addition of a second thumbscrew. I used them last night on the waxing gibbous moon and Mars, and was impressed all over again by the quality of the views. I just acquired a second pair of binoviewers this week, though, and can't justify having two on hand.
I paid over $400 in 2000, and looking to net $225 including shipping within CONUS.