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Xfininty used to have 3d on demand as well. I have a 3d tv from 2012 and love it. It also has an interesting feature where it can interpolate 2d => 3d which depending on the content works very well, or is a complete mess.

I have used Vudu for 3D streaming and it worked perfectly.

Unfortunately, not every device supports Vudu's 3D!

The important ones, PS3 and PS4, do however.