I was very disturbed to find that the public face of Beattie Intenscreen (long-time makers of superb quality third-party focus screens) at camerascreens.com now indicates that they are no longer in business. This appears to be a fairly recent development in that a 26 September 2015 crawl by web.archive.org showed a fully operational Web site offering a full range of product. In addition, a recent thread on this site featured a link to a product page that apparently was recently live.
Beattie Intenscreen Bright Focusing Screens https://web.archive.org/web/20150524073548/http://www.camerascreens.com/index.php
If Beattie truly has ceased operation, this is a sad time in photographic history. Beattie screens have long been a high-performance focus screen option for professionals. Although support has been limited in recent years to film camera models, their demise would be a significant loss.
Steve