A newer 90 coe glass on the
A newer 90 coe glass on the market is Wismach Glass, Paden City, WV. Their glass is a lower cost alternative and can be seen here: http://www.delphiglass.com/bullseye-90-coe-glass/wissmach-sheets-90-coe/
Also they are working on a 96 coe that will be compatible with Spectrum, not too far off from what I am hearing.
The Wishmach dichroic is outstanding, lots of different textures with nice dichro coating done by CBS.