The Back Scratcher is only available in Chapter 2, shortly after finishing Chapter 1. Head to any Shrine at Black Wind Mountain, and you'll be able to buy the Back Scratcher. It costs 2400 Wills.
The Back Scratcher is one of the Curios items you can easily miss in Black Myth: Wukong, especially as it is actually located in a chapter you have already completed by the time you have access to it.
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