Ink (1 oz.) 8gp
Seriously? How many pages of writing would that be?
The reason I found this is because for a sunken city type campaign location I’m making a bunch of technomagical items an naturally Helmet of the Squid will have the ability to squirt ink (non magically). I mean, if someone has a magic item worth 30,000+ gp they probably aren’t worried spending a few hundred keeping it loaded with ink for their submerged adventures, maybe there is some reasoning behind it that I don’t know.