If my memory is correct, they only built two, plus a cockpit section as a crew trainer.
The third Buran was cancelled, as I recall.
I'm equally saddened to see the flown Buran as a wreck, and , somehow, vaguely hopeful that the barged one might be rebuilt to at least decent static display condition.
It seems that going back a half step, and building an enlarged version of Spiral in modern materials might be the way to go for the Russians, as doing so would also provide a useful alternative C.E.V
Kind and Respectful Regards, Uyraell.