Kodak E200 in 120 format was discontinued in Summer 2009. Kodak did not publish a notice of this happening, but kept manufacturing the film in 135, so technically E200 was still available. As a heavy user of this film I stocked up and filled my freezer. Glad I did, as a fellow shooter and I cleaned out Freestyle and B&H (Thirty pro-packs) and it was never restocked. The last batch was dated to expire January 2011.
E200 was a staple of many astrophotographers and offered the best reciprocity characteristics and color stability of any E-6 film. It also was the most red sensitive slide film (Fuji Provia 400F, a close second) for capturing faint emission nebulae.
Provia 400X is a great film to consider as a replacement, but lacks the red response Kodak E200 was famous for.
For color film astrophotographers it is like Kodachrome going away, but at least we can still work off our stock!
Milky Way Splendor by Nightfly Photography, on Flickr