White melamine shelving (North Town SL6)

I'm looking for 1 or 2 piece(s) of white melamine shelving, minimum 56x46 cm, ideally with one of the longer sides (56cm) edged in white.
I wonder if anyone has a suitable piece sitting in their shed / garage that they no longer need. I'm aiming to add some shelving to a unit in our bedroom.
Thank you for reading.
Pat