Doreen and Hay House's books and decks are extremely prolific in major bookstore chains in North America. In Canada, there are more DV decks in Indigo stores than there are combined variants of the Waite decks. She's cornered the mainstream market, and if you want non-Rider decks, you generally have to seek out specialty stores such as occult shops.
As for "Turro," consider that Radleigh had years of Tarot experience prior to collaborating with Doreen. I'm fairly confident that "Turro" is a deliberate marketing ploy to divert the brains of her sensitive audience away from conjuring up images of Satanism and demonic entities when they hear the proper word "Tarot."
Bear in mind that in her books, Doreen regularly decries divination techniques like crystals and runes as dark and of malevolent forces if they don't line up with her specific Angel Brand. She must do everything she can to assure her hardcore followers that what they're using is not demonic Tarot, but Doreen Virtue Angel Turro. Just pronouncing the name differently creates a contrast to pillow the senses.