If you are looking for a physical copy with a durable "solid paper" (hardback) cover, you can check the following major retailers. Prices generally range from for new editions.

You can find PDF versions of the Part 2 textbook through several educational portals and community groups:

: Good for finding pre-owned hardback copies at a lower price. Some listings specifically mention "softcover" (мягкий переплет), so be sure to ask the seller or check the description for "hardbound".