I love my marble rolling pin. I also threw out my light wooden one years ago. Marble is the perfect companion for pastries and cookies.
I saw some grey/white marble ones not too far from (to the right of/north of) the sushi area in Superstore just last week. They have a whole display of marble kitchen tools...including a large marble slab for rolling things on, cutting etc.
They say that marble stays cool and that helps make fluffier pastry, etc. That was more pricey of course, but I sure gave it a nice double take and just had to touch it.