I just bought this S-Pen from Amazon for $11. I can't tell any difference from original:

https://www.amazon.com/gp/product/B014R9B7VU/ref=oh_aui_detailpage_o06_s00

http://www.amazon.com/Samsung-Stylus-Galaxy-Note-Packaging/dp/B014R9B7VU/ref=sr_1_1?s=wireless&ie=UTF8&qid=1452138391&sr=1-1&keywords=note+5+s+pen

Try this one, I had the top of my S-Pen break and decided to order instead of going through customer service, works exactly as the first.