I got Pentel brush pens from Amazon. They’ve been pretty good so far. No signs of running out of ink yet. They come with one refill and a pack of two refills are only around $4-$5. They also work well with copics and watercolors.
Also, one notable thing about this particular brush pen is the ability to make really clean fine lines, if you’re delicate with it. I’ve had other brush pens in the past and this one so far had the best line control ever.
where do u get ur brush pens , and how efficient are they?