Buran?

I don't know of any full kits currently available, but AModel has announced a 1/72 scale version:

http://www.cybermodeler.com/special/2008_acft_manuf.shtml

They certainly already have the molds for the fuselage, because there's a version of the Myasishchev VM-T Atlant kit that includes it:

 http://sovietwarplanes.com/board/index.php?PHPSESSID=e926f3c340d4cb2d9a4ce3f379738777&topic=391.new

Hope this helps,

Bruce

If you're not afraid of cardmodeling, there is a great (and not hideously complicated) 1/96th-scale Buran and Energia available here:

http://jleslie48.com/gallery_models_real.html Just scroll about two-thirds of the way down and you'll find it.

Here are some photos of my build-up of the model:

http://www.starshipmodeler.org/gallery11/dh_112106_buran.htm