Does anyone have any good recommendations for places to buy wood?

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Does anyone have any good recommendations for places to buy wood? Looking for 1/8" or thicker

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Can only speak for the US: Ocooch Hardwoods.

3

1/8 or 1/16 mdf source?

4

Every box box DIY store I know carries 5 foot by foot 1/8 baltic birch you can cut into any size you need - real cheap