Chamblee's isn't listing DD as available right now. I'd planned on getting it there because I've grown a couple of other Buck roses on their own roots and they've performed well.
I've gotten in on those clearance specials from Wayside Gardens when it is rather late to plant, but have had great luck.
"...and don't think the garden loses its ecstasy in winter. It's quiet, but the roots are down there riotous." Rumi