J&C in the banner above is also listing it.
You can also mix it yourself with this formula for the original Beutler's developer:
The link also contains another link to Photographer's Formulary, which sells a kit.
Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com