Where can I buy light weight fake rocks for Halloween?

Q: I have a flower bed in my front yard and for halloween I want to make a graveyard out of it. But I want fake rocks to outline the cemetery plots because I don't want stupid idiot kids picking up real rocks and throwing them thru my windows. I can't seem to find them at our local crafts stores which is Michael's and Joann's so those answers won't help me at all. Anyone have any ideas?

A: Yea or maybe take some newspaper and crunch it up and sticky tape it into rock shapes and spray them light grey, a craft shop should give you good ideas too, theres 1 on Chapel st if youre in Melbourne, near J B HIFI.

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