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I doubt you will get anyone who will willingly trade you their purchased course material at all. Offensive-Security Watermarks their course material (e.g - Accompanying Lab Guide and Course Videos) with the customers personal information (OS-ID, Name, Address, and E-Mail Address). Offensive-Security students who sign-up for the courses agree to accept a ToS Agreement stating that they will not distribute the course material and more. People who distribute or trade this material and Off-Sec finds out about it will instantly get their Certifications revoked (if they have any) as well as possibly legal action sought against them (I do believe this was stated in the contract).
You would be better off saving up and taking the course yourself.
eCPPT (Silver/Gold), GSEC, GCIH, OSCP, OSWP