Marble pastry board or largeish piece of reclaimed marble (New Marston OX3)

I just broke my marble pastry board--I dropped it and it split despite bouncing off my foot on the way down (ow). So I don't want another new one from China; I want an old one that's a bit more robust. Having checked Ebay without success (reclaimed marble collect-only from Llanelli) I thought I would see if anyone has a piece of marble in their shed that they don't want! (It has to be marble to keep the pastry cold.) You never know. Thanks!