No commercially made plates made for general use. However, Ilford make glass plates for specialist applications and launched the Holo FX a couple of years back - It looks like Adorama are the only current USA supplier.
You could have a go at coating your own plates using a liquid emulsion - A good source of plates are microscope glass slides intended for brain or other large tissue samples. Some of these slides can be had off the shelf up to 5x7, but 5x4 slides are more common. As a bonus, they are usually around 1.2mm thick.
Last edited by paul_c5x4; 01-18-2013 at 06:34 AM. Click to view previous post history.