Software keys for under 5 dollars

Hey community, i posted this because i need your help, we all need help from time to time that's why i came for you asking for it.
im looking for a website where i can buy software keys for windows .... if you ould help me don't hesitate, and i know you won't that's why i thank you in advance.

I’d try ebay although the shipping is going to exceed your (under $5) price limit