Hollywood junction is a small shop like a newstand on the corner where you would turn to get to ToT. the pennies I believe are behind it on the "hub/great movie ride" side.. if you get to brown derby on your walk in, you went to far and past it.
The only prop shop I know is a space that can be rented for weddings or functions and your not going to get to it..
but also be on the lookout, things always move around WDW and there can be penny and quarter machines anywhere.