Wood for Cutting

It seems impossible to find 2mm wood sheets to make Art projects, like the spectacular Mandala from Vector Graphics. They use 3mm wood. I have 2 sheets of Birch plywood 12 x 24 that I plan to use as practice, but need more than 40 sheets to complete 1 project. Does anyone know of a source?

I’m not sure if they sell it in bulk through the website, but you could try Michaels. (Disclosure: I work for Michaels.) I tried looking for our supplier online but haven’t been able to find them. I did see a couple of sites selling to the model-aircraft and model-ship community, but generally either balsa or basswood and no wider than 6"…