ViVi Magazine May 2009 issue cover which has Ayu's picture is printed on T-shirts that are sold through YESSTYLE.com and it's from a Korean vendor.
I'm not really sure whether they already asked for permission from ViVi magazine publisher to put one of their pictures into the product and sell them to people.
but whatever if you wanna buy it go here:
Picture taken from YESSTYLE
Credit: Ayumiko @ AHS Forum
Original source: YESSTYLE
Shared by Ayu's Story