Amazon.com : Astromania Stereo Bino Viewer - Telescope Binocular Allows You to Adapt Two eyepieces to Your Telescope and View with Both Eyes simultaneously : Electronics
Teleskop-Express: TS-Optics 1.25" Wide-field Binoviewer with 30 mm Prisms for Telescopes
William Optics 1.25" Binoviewer with Eyepieces | OPT Telescopes