I don't know where you are from, but if you are interested in purchasing the yellow plastic tablecloth.... they had 6 rolls of it in Worcester, Massachusetts Building 19 yesterday when I was there.  It was either $1.00 or #1.50 a yard.  Can't beat that!

We did Wizard of Oz a few years back & opted out of putting a "road" on stage, as no one in the audience could see it anyway. We did however create a "yellow brick road" ramp up one side of the stairs leading on stage & Dorothy skipped in & out of the audience when she traveled the road. We used the wooden stair frames you can buy at Home Depot or Lowes & plywood to make the ramp, inverting the stair frames to rest on the theater steps. Then painted it yellow with lines for brick.

Yes, we did Wizard last year and used three pieces of masonite that had the brick embossing.  We cut them into 'S' shapes, painted them yellow, and pieced them together as needed so it ran through various scenes.