I have called around a number of local lumber yards, to order 5' x 9' X 1/2" plywood, either douglass fir ext grade or marine grade. They make it seem that 5x9 is not made anymore, or at least not available from their suppliers.<br /><br />Really prefer getting the 5x9, because it will require three 4x8 to do the floor and end up with another seam. Two 5x9s will allow me to do the floor plus have a piece left to do a casting platform. <br /><br />Do the large chains have this to order (Home Depot or Lowes)? The ones I tried were mainly lumber yards, which I thought would be better equiped to get this.