I have one yellow tiger lily "real touch" hair flower from Enchanting Memories in Canada. It is kind of big.. hopefully you can tell from the pictures the approximate size. I didn't actually end up this one. $15 (this includes shipping in the United States, if you want more than one I can cut some off the price)
I also have one other yellow hair flower from the same company. It's more of the common silk type material hair flower, and it's quite a bit smaller. I actually did use this in my wedding.