Answer: There are a number of different kinds of "Dusty Miller" so the one you saw might be "Silver Lace". Nurseries with a good selection of annuals would carry it as a bedding plant in the spring.
There is also a perennial artemesia with a very fine texture, it is called "Silver Brocade". It could be used in containers as well. Here is a picture in case this is it.
Good luck with your search.
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