I found it at Home Depot in Watchung the last couple of years.
Alas, it did not survive winter in my garden, and neither did the lady's mantle.

neither did my ladies mantle. i lost many perrennials this year -- daisies, english daisies, gallardia, lavandar, some cone flowers, black eyed susan, sunflower, mexican petunia, heather.

Wow sugar magnolia, you lost quite a bit of tough ones such as cone flowers. I don't understand what happened to my lady's mantles: they came back last year but this year only one survived. They were in the warmest area of my garden, where even dahlias survive our winters, so I don't think it was the cold... and it was a dry winter as well, so I can't figure it out.

I had Artemisia, Powis castle for a few years but now that you mention it, it's gone. I think I over did the cutting back. But that one should be an easy find. Most of the well stocked nurseries will get it in unless it has suddenly gone out of fashion. Doesn't Well Sweep have a collection of different artemisia?

Strawberry Blossom has small pots for $4.99. They have Silver Mound too.

Strawberry Blossom is on Route 23N in Wayne.