I ordered a package of watered silk miniature carnations from Will Boehlke's A Suitable Wardrobe store last week.
I received them yesterday and they're terrific. They're the perfect size (much smaller than traditional faux flowers), and they're much more real-looking than the silk flowers found in a typical store. To see them in action, do a search on Will's site for "Andre Churchwell," a Nashville doctor who's been featured several times on Will's blog. He seems to have taken to wearing a red one all of the time.
They're only available in a three-pack for $25. That comes out to $8.33 each (okay, $8.34 for the third one), so they're a little pricey, but that includes shipping from San Francisco to anywhere in the continental U.S. (Before ordering, I did an internet search for something cheaper, and had no luck.) They're available in dark red, white, pink, or one of each, which is what I ordered.
They're well worth it.