I purchased my material from 4D Model Shop very close to uni. I needed to get plywood, acrylic plastic in my chosen colours (or something as similar as possible).
I wanted to get my wood cut as soon as possible as i knew it would take a long time. So i paid to use the uni laser cutting services to get an hour of cutting to get my wooden discs done.
The wood burnt quite a bit because the machine was on such a high setting. I can easily sand it off though this can take some time.