Here's a Decca CD with the Tchaikovsky 1, the Borodin 2, and the Shostakovich 8:
http://www.amazon.com/Tchaikovsky-String-Quartet-Borodin-Shostakovich/dp/B00DPH7RKQ/
The Lp with the Shostakovich backed by the Borodin should also be easy to find.
http://www.amazon.com/Tchaikovsky-String-Quartet-Borodin-Shostakovich/dp/B00DPH7RKQ/
The Lp with the Shostakovich backed by the Borodin should also be easy to find.