Quote Originally Posted by 904
But the best way to have an unlimited number of cheap pinholes is to learn how to make good pinholes yourself. After a learning process it is easier than you think and a lot of fun. There are several methods to do it. You can find a lot of information in this forum.
That's of course very true - it's more satisfying to make them yourself! But still...

I have been experimenting with a needle and tin can metal up to now. I was looking for small drills, but 0,3 mm seems to be about the thinnest I see in (web)shops. Anyway, like you said, there are an infinite number of methods to try left.