If you're looking for a super cheap pen, check french BIC pens: https://duckduckgo.com/?t=ffab&q=bic+pen&ia=images&iax=image... ; it's less than €0.30 ($0.35)

and don't stop on the price ; this pen is amazing,

it's actually one of the recommended tool, used by the super talented and proefficient korean drawing artist Kim Jung Gi: https://www.youtube.com/watch?v=DmqFbgKWoao (not sure he uses it in this video) ; Kim is known to be able to draw anything from memory

you can see him drawing with the BIC pen here: https://www.youtube.com/watch?v=30_IDH1TzFs&t=1231s (video: Kim Jung Gi - What Kind of Pen Do You Use?)