I found a US supplier and purchased 2 pair of the Xpand - x105-rf-x3 horizontal polarized glasses glasses for JVC projectors.
I received them in a week shipped UPS from Oregon to Florida.
They work great with my 4910!
I still wish in general I could get a brighter picture although it's still good. It may be I have to dial in my 4910 a bit more for optimal brightness.
If anyone has optimal settings for 3d it would be appreciated.
Unfortunately I have a Dalite Cinemavision 1.3 gain screen which retains the polarization at a very high level.
I also purchased a pair of the $19 Xpand's for Mitsubishi to try and unfortunately with the screen were still too dark. If I turned them 90 degrees sideways
to mimic the horizontal polarization they looked great. I have to say the emitter included with the $19 Xpands works as well as my $100+ JVC emitter.
I was asked to not publish the price of the x105-rf-x3 glasses but they are substantially less than the JVC glasses and I would think work just as well though I
have not done a side by side comparison.
The email to order them is: email@example.com