Hello all,
  I posted a query about purchasing a quartz window.

I recieved two replies:
Edmund Industrial Optics  (They didn't really have a plain vanilla window -
They focus more on optical flats)

http://www.mdcvacuum.com/ was also suggested for glass windows.

However, in the meantime, I found www.almazoptics.com had round quartz
windows in a variety of sizes.  I got two for about $90 each.

Thanks all.

David Nemeth
Process Engineer
Sophia Wireless, Inc.
14225-C Sullyfield Circle
Chantilly, VA
Ph: (703) 961-9573 x206
Fax:(703) 961-9576