I seen these a few months ago. They have a changing portrait one, A pumpkin,and a few others.
I was thinking of trying a group buy on these If 20 members are interested I believe wholesale cost is 11.00.
Here is a video clip of the tombstone DVD It has many more tombstones than what the clip shows.
OKAY video didn't post but here is a link to a site that is selling them.
Virtual Tombstones DVD | Twisted Ambience | DVDs | Grimm Brothers Halloween Specialty Store |