If you're just needing a stylus for normal touch-input, then any passive stylus should work fine. However, if you also want it for handwriting features or anything beyond basic touch-input, then you'll need one of the Surface Pens as they're the only styluses compatible with the Surface Duo. The standard Surface Pen, the new Slim one, and even the big Hub 2 Pen all work, and they can usually be found on eBay for around $35.
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Sorry for replying twice, my server glitch out for a second and I accidentally posted the same reply twice. ๐
Thanks! Cant really find any passive ones for sale in my country and ordering online from amazon or ebay becomes quite expensive with shipping and taxes. I found a used surface pen on a local online market so I made a request for that. Thanks for letting me know about those, this stylus stuff is confusing....
I would think a simple passive stylus for capacitive touch screens would work fine.