Best answer: You can buy a replacement S Pen directly from Samsung in black, brown, yellow, or purple, but you'll find that third-party retailers sell them for a bit cheaper.
Can you just swap out your S Pen?
If your S Pen goes missing or you've just decided you want to try a different color, there's no better place to buy something than directly from the source. You know you're getting exactly what you're paying for, and should something happen to go wrong, you only have to deal with one company to find a solution.
Samsung has the S Pen for the Note 9 available in black, purple, brown and yellow (called blue, to coordinate with the blue Note 9) for $30. Once you receive your S Pen, just slide it into the Note 9's silo to pair the two devices together.
Be wary of cheap knockoffs
As with any product, there are bound to be third-party options available for cheaper that claim to work flawlessly, but don't be fooled. The S Pen for the Galaxy Note 9 has more nuanced features that third parties simply can't replicate.
That doesn't mean there aren't good outside sources to buy a legitimate S Pen from. If you look on Amazon, you'll find that the official Purple Note 9 S Pen is selling for slightly less than the one on the Samsung website. Just do your research before buying from a third party, but you can get a good deal.
What about S Pens from older phones?
If you have an older S Pen sitting around from a phone like the Galaxy Note 8, it'll technically work with the Note 9, and it'll even fit in the phone, but it won't have the super-capacitor inside the Note 9's S Pen that allows for its wireless capabilities. Plus, with the Note 9 S Pen sitting at around $30 right now, there's no point in spending $20 more on the older model. Does not compute.
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