Hotels in Russia have gotten better priced recently, but this is more than a regular sale. The DoubleTree by Hilton (which I've booked myself in the past for as high as $200) is available for $36 on Hilton.com and Agoda.com.
If you use Agoda.com you will get an additional 6% cashback with TopCashback.
The hotel fetches excellent reviews (4.5 of 5 on TripaAdvisor) and is described as one of the best hotels in Siberia. If you have plans to visit the S7 Airlines hub, you should get into this deal.