$10 Secret Santa gift ideas for a nice, smart, quirky, nerdy high school girl

Parent Cafe
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Taking the gel-pen idea one step further, my D adores fountain pens. I got her this last Christmas:

https://www.gouletpens.com/pilot-metropolitan-fountain-pen-retro-pop-turquoise-medium/p/PN91446

There are nice lower-priced fountain pens as well.