I buy the flooring samples. They are .50 each. They're free at Home Depot but Lowe's has a more varied selection. I make sets of coasters out of them and give them away. The polished cork flooring samples are nice because the bottom is unpolished, so it's just like a normal coaster, but the top is nicely polished. I also do the wooden ones too. Where else can I get small, thick pieces of handscraped chestnut for .50?
I have also mixed and matched them together and made trivets.
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Plan the work. Work the plan.