Like Gozur, I use the Ikea Forby, they are kinda cheap feeling, but what do you want for $5 a chair! These fit perfectly under my Astro and Windy cabs. My exceleena cab is a bit taller, so for that I do what clubninja wrote, I just got some free rolling desk chairs and took the backs off them (they are adjustable in height).
BTW: the chairs in your pic are ~$80-$100 a piece. Japanese arcades also have square ones, again very pricey. You'd have to import them.
Here are the forby's in action:
