Plywood sheets (Odd Down)

Hi,

I have a little project which needs quite a bit of plywood (any type really). Having looked at how much it will use I got a bit of a shock at how much I would need to spend so I thought I'd chance my arm and see if anyone had any old offcuts they would be happy for me to pick up. Larger the better but anything bigger than, say, 2 square foot gratefully accepted!

Thanks,

Ben.