We have this "Nataraj Glow" ballpoint pen in India that you can get for 1 INR a pop. I bought a whole lot of them (100s) during school many years back and still use them. I lost pens regularly but it really didn't matter since I'd go back home to 99 more. Since school my pen usage has dropped significantly, but I still find them lying around the house strewn about here and there for when I need them. Love them, never needed anything else personally. The best thing about them is that they don't dry out or break or leak easily, so you can treat your pens with neglect, disrespect and be generally forgetful, e.g, losing the cap, putting it in the washing machine, etc, without paying for it in any way.

They are thrice as expensive (3 INR) now, but that's still throwaway money: https://www.amazon.in/Nataraj-Glow-Ball-Blue-Pack/dp/B0DF7YC...