Ask HN: Best Cheap Tech Gifts

Hello! We're approaching Christmas and the gifting epoch of the year, and I foresee that I will be involved -voluntarily or not- in some Secret Santas. Since I'm a tech lover I would like my gifts to be of the same kind, so I'm gathering a list of cheap tech gifts. What have you been given of this type and that you have enjoyed? Thank you very much for your help!