I highly suggest fountain pens, I like Lamy. I feel like I can write a lot more without fatigue. You don't have to press as hard. Also, if you're not a person that loses pens they end up being cheaper.

I also found that A5 grid paper on Amazon for a little cheaper[1]. But I'm curious how well the binding holds up. Because if it holds well it'd be a great switch for me.

[1] https://www.amazon.com/Midori-MD-Notebook-Grid-Paper/dp/B009...