I got the free Vivaldi offer from DTB last October (they arrived last week), but only because I'd placed a seed order with them, otherwise I would have posted about it here. At the moment they just seem to be offering a discount on Tomato, Bejbino F1 with seed orders.
I've grown Vivaldi from Sainsbury's in bags in the garden (nervous about using non-certified up at the allotment). Family gave them the thumbs up