Nvidia 3D glasses from ebay?

I have recently installed Windows 7 and discovered that unlike XP, it supports 3D. I searched ebay.in and the glasses cost around 300 Rs.(1 x NVIDIA 3D glass 1 x Double Gifts, 3 D Glasses anaglyph red cyan/blue 3d 3D | eBay)
Are these reliable? Should i go for it?