Do you have any pictures of the vinca you are interested in so that we know what you are talking about? Usually, the trailing one refers to the evergreen perennials, especially Vinca minor, which does so well in cooler climates.

OK, I took a look at the Swallowtail website and they don't even sell the Vinca minor or V. Major, but do sell a lot of the Cathranthas roseus varieties, which is COMMONLY known as Vinca. The reason they don't have it right now, is that they are sold out of their seasonal crop of seeds. This isn't the time of year to purchase some varieties of seeds. Call or email them to find out when their 2012 Catharanthus seeds will be available.

I don't think that their rating was all that bad and it appears to me that they did what they could to resolve most of those issues. Sometimes, the customer can be the reason for seemingly poor service.

They sure do have a plentiful listing of varieties. Try the Forum (here in gardenweb) that rates venders and see if Swallowtail is mentioned.