In case I'm not the only one who never heard of a boniato, here's what Wikipedia says in their article on the sweet potato:
"In the Caribbean, a variety of the sweet potato called the boniato is popular. The flesh of the boniato is cream-coloured, unlike the more popular orange hue seen in other varieties. Boniatos are not as sweet and moist as other sweet potatoes, but many people prefer their fluffier consistency and more delicate flavor."
Sorry about that, and thanks for the clarification for others. I THINK I might have found them at Caputo's, except they called them oriental sweet potatoes. They look like some of the pictures I found on Google. Reddish purple skin and white flesh (thankfully a few were broken so I could see the flesh.) Cost me all of a buck for 2 of them. I'm going to use them in the recipe I have for a boniato mash and see how it tastes. I'm attempting to make skirt steak with a basil chimichurri with the boniato mash. I had a similar dish at the Epcot Food & Wine Festival a few years ago. Wish me luck : )