Junipers don't 'divide' but you can grow them from cuttings.
It seems to me that your local nursery would be willing to order some for you.
There are some online nurseries listing Grey Owl Junipers. Just make sure to read all the reviews before you commit to an online order. Don't buy plants through Amazon or Ebay.
You could always put another type of juniper in place of the dead ones.