Here in the West, purple carrots aren't a commonly found in your local produce departments. In fact, you'll probably have to go out of your way, by searching for them at the fringes: places like your farmer's market or a specialty grocer. There's a little vegetable stand near my house where I can find maybe 3 or 4 at any given time (mostly because there's a woman who comes in every morning and buys nearly all of them for herself). The shop owner literally can't keep enough of these guys on hand. In short, these guys are special. Remarkable even. And they're almost certainly a topic of conversation when served to dinner guests. They're so special, they make the chef look special, too.