Yesterday I'm lucky to find a no brand $2 (around that) did pen that came with 5 nibs. I bought it is since its cheaper than the others branded one that I obviously can't buy. :v
The nibs came with the 0.75 for the smallest, so not really good for detailed lines.
The one that's more expensive is the ink tho, 14ml Indian ink by Windsor & Newton, but it's long lasting so it's okay.
I only find it hard to let the inks flow the way I wanted (I use my saliva here, but same result). Maybe because I'm inexperienced or whatever, but the way it flows kinda disappointing.