What is your go-to plywood for shop cabinets? THickness for boxes (3/4 or 1/2). I have been quoted baltic birch 18 mm at $95/sheet at 4'x8' and 5x5 at $77. The 12 mm is $76 for 4x8 and 43 for 5x5. Still waiting on a cost from the lumber yard for Grade A and B plywood. Our local box store has Sandeply for $65 and birch (Columbia forest products)for $83 (3/4 4x8) and $45 and $67 respectively. I have not laid eyes on it, however.