From Craigslist:
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have about 600 sheets of 5x12 plywood 5/8 thick Im selling it for $5.00 a sheet these are brand new not used if you figure the square footage it equals just as much as 2 4x8 sheets put together you can purchase as much or as little as you want delivery available call rocky (401)269-9934
Man, I wish I had a project for it and lived a bit nearer!
R