This is a bit of a stretch, but this wholesale nursery shows Dianthus Doris in their catalog, although it's probably not available at this time of year.
http://www.sunnyborder.com/cat...
You might try contacting them to see if there is a retailer in your area who can get them for you. Or click on the "Find Retailer" button on the left hand side of the page. They only do business there on the east coast, but they do supply retailers in MA.
