Hi Steve,
My mouth is watering as I type this just thinking of these berries! I realize you have been searching, but have you searched with the term:
heirloom black raspberries
heirloom black raspberry
Then you can click on the cached version and quickly scan through the material and see terms highlighted.
I just did a quick google with Haut black raspberry and found this site. I'm including the cached version.
National Gardening Association :: Gardening Articles :: Edibles :: Small Fruits & Berries
I found this:
So I googled: Harry Swartz + Haut raspberry
and found this:
SSan.com: Blackcap Brambles
You might want to contact them and ask if they know where you can purchase plants. You don't say where you live, but if you are in the area where the plants grow as natives, you may be able to find some in the areas they describe and dig some out. I did read on one site they ripen in July instead of August, the way most raspberries do.
At another site I found with a search using:
Haut raspberry retail
Government Investment to Begin Vineland Renaissance
In skimming through that Canadian site they mention Vineland.
Then I searched the site with the word Vineland and found this page about The Vineland Research Station. The contact info was at the bottom.
Government Investment to Begin Vineland Renaissance
You might want to contact Vineland in Canada and ask them for leads to retail nurseries.
Does it help knowing how I searched?
Newt