This must have been a #mistake. LOL I picked up this 5 pack of Kokuyo Campus B5, 100 sheet #notebooks for $6 per book. Most places list an individual book for $10-$14 USD.

I'm using these books for my daily writing now. Mostly because of the price, compared to an Apica CD Premium #notebook priced at $16 dollars, the Campus seemed like a reasonable option. I've seen that Doodlebud has compared these against his Muji paper, and thought that it was comparable. But since I don't have access to Muji paper here, the Campus is the best option.

These do hold up to #fountainpen usage. While I mostly use a fine nib, I have used a medium and even a broad nib with it, and it's been good. I don't know if it would work well with a 1.1mm nib, but I may try it at some point.