There are a million places to get pallets you just have to keep an eye out for them:
For easiest build, avoid super dirty or oil stained ones or those that have planks that have become unsecured or about to split. You don’t want ballets that won’t be able to handle your weight. Also be careful of any crates with bad smells (be careful of where they come from).
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Pallets marked MB have carried dangerous chemicals.
Hose down or handwash the pallets as necessary and let dry. If you selected good pallets from the start, much cleaning won’t be needed.