There are/were many cultivars sold in florists' shops, such as 'Princess de Galles', and various Parma violets. As the years passed some former favourites were supplanted by other 'new and improved' ones. There are denizens of this forum better suited than me to giving you a detailed answer, and some of these good folks happen to be growers and suppliers, so you should be in luck as regards obtaining some of these violets. Don't expect them to stock every old variety, however!
Have a little patience and see who replies...