u/Equivalent-Worry8295

I do color by numbers and those coloring books use a set of colors. I’m finding my most used colors are running out of ink. Ohuhu only has certain colors refills.

Do you guys have ideas on the least expensive way to replace certain colors. I currently own the 320 marker set. I’m wondering if I could get away with a smaller set to replace those colors in general.

I wonder why they don’t carry refills for all colors?