Duplo bases small/medium size (Sidcup DA15)

I have a couple of the larger size green base plates 38x38cm (24 x 24 studs). I am looking for some smaller sizes 25x25cm (16 x 16 studs) also 8 x16 studs. 4 x 8 studs or 6 x12 studs any colour will be much appreciated ideally not green!