Several times I ordered plywood of 3 and 4 mm grades 1/2, the application was always executed literally the next day. There was only a delay once, but then everyone correctly explained that there were a lot of orders and there was not enough in the warehouse of exactly the volume that I needed. Very honestly and without any promises for tomorrow.
We were looking for waterproof plywood for the cladding of the terrace and only from the specialists of the Russian Plywood company we received a full and clear consultation on the choice of material characteristics. No one tried to "sell" the most expensive product, but reasonably explained the properties of the varieties. And also, taking into account the sheathed area, we selected the optimal size of the sheets.