Do you mean the official, old-fashioned Violetta class? I don't know of a seed source for any of that kind; in fact, only one ('Rebecca') is still sold in this country as a clone cultivar, if the 'Rebecca' of modern horticulture is even the same plant. Most of the others that may be extant, like those listed in the RHS Plant Finder, do not seem to be for sale in this country as either seed or live plants. Perhaps a close second would be some of the other relatively perennial Viola types like 'Arkwright Ruby' which can be had by seed, or 'Rebecca' or 'Etain' which can be found for sale as live plants.

Perhaps you meant some more easily had type of viola, which would be an entirely different matter.

"Hi Stefanb8,
No, I'm afraid I do mean the old-fashioned violettas. I used to know of a source in the UK for a viola/violetta mix, but can't remember any contact information. I do remember that for the past 5-6 years he hadn't been able to produce stock of any great quantity due to adverse weather conditions. I will continue to look--I posted in the UK gardening forum already. Thank you for your comments. Janine
PS I've grown all the violas you mentioned. They're all very nice."

thanks again. the quest continues.......