Jotter Refill

I have been into pens for quite some time now and what got me into it was the Jotter, excluding my fountain pens, I have tried all types of ball points gels and roller balls and I keep going back to my jotter unfortunately I’m running out of ink, when researching I saw schimt refills which i have tried and was not a huge fan. (I did buy the 5$ ones) that could have something to do with it. Any recommendations for jotter refills?