I'm looking for a piece of semi-reflective glass (such as you use for a teleprompter or 3D rig). I have an experiment I want to do with it and I'm looking for where to source the glass itself (size should be around 8.5"x11" or that of an ipad).

Thanks

You might want to do a search on "Beam-Splitter Glass".

I found this.

TELEPROMPTER Mirror Glass 12x12 Beamsplitter | eBay (http://www.ebay.com/itm/Teleprompter-Mirror-GLASS-12x12-Beamsplitter-/260502695478)

J.

Also many glass store carry this & can custom cut.