I've bought these mobile stickers in my country, Spain. I found them in a new "bazaar" managed by Chinese people near my house. When i saw Ayumi I was shocked... then i bought them for only 0'60€ (~0'75$). ^_^
Of course this is not an "official" item... but i'm happy with it xD
Also, I've made some "research" and i've found the image is taken from CDHITS! Magazine (May 2003) ^_^