Q.Geranium cantabrigiense ‘Karmina’
Does anyone know where I can purchase GERANIUM cantabrigiense ‘Karmina’ either in the Northwest or online? Or is there a more readily available hardy geranium that is similar (i.e. dark pink or purple color, small flowers, small leaves, clumping or cascading shape)?

I recommend that you make an inquiry at your local garden center or nursery, if they do not have this specific variety in stock they may be able to special order it for you.
There are places on-line that sell it. I did a quick Google search and found the following on-line merchant, for example:
http://www.whiteflowerfarm.com/29564-product.html