Couldn’t resist a bit of Googling.

40 cents each in bulk:

https://www.alibaba.com/product-deta...40b821b0JIMoNV


These must be the good ones, as they are $3.08:

https://www.aliexpress.com/item/32801541338.html


Gas struts, from $3:

https://www.alibaba.com/product-deta...5d095aafmlybVL