Japanese 3D Win Corp. offers a device called Ritta - a stereoscopic Converter for Video Glasses.

Ritta is converting standard video into a stereoscopic video experience.
Some HMDs offer this already. They just shift the video for the left and right eye a bit to achieve stereo vision. The results are not that great. It is not clear to me if the Ritta device is more advanced and greats an interesting 3D effect. The Japanese company bundles the video glasses from iCuiti with their device.
The Ritta stereoscopic converter plus the iCuiti VR920 Video glasses sell for 198,000 Yen (~$1,647) in Japan. The iCuiti V920 sell for $399.95. So the Ritta 3D device has a whopping $1,300 price-tag. Either it is a rip-off or it is great expensive technology. The V3920 support already 3D viewing with software drivers.

See also the Ritta product page Japanese. Via Nikkei.Net.