Samsung Galaxy Note9 Original Replacement S Pen EJ-PN960BJKGKR Silver/Cloud Silver https://www.amazon.com/dp/B07QDXBQCW/ref=cm_sw_r_cp_apa_i_x1uCDbVAKBXXK

OEM replacement from Amazon. I purchased this when mine stopped clicking. Worked perfectly. You may find cheaper listings.