I've been looking for a stamp to add resistor values, instead of writing them by hand. I did find some, but they weren't customizable and the shipping price was upwards to $100.
After some more searching, I found Itou-Kinzoku in Japan. They offer fully customizable rubber band stamps, so I thought I'd give it a go. I got four bands with the letters, numbers "1 2 3 4 5 6 7 8 9 0 M K". Itou-Kinzoku's representative made sure that I got the right height and width, and the right kind of rubber for my use.
It all worked out as I had imagined. Not only does it look a whole lot better, but it took less than half the time it used to, to assemble the kit.