I must side with your friend, in saying that I was surprised to find anyone that actually like Pepsi Blue.
I had only one occasion to come across it, when I was out visiting my sister back east. She had offered me a beverage I don't really care for sodas but it was hot. I did not think much of it when there was only one missing. After tasteting it, I knew.
I hope for you, that you can find some. I know how it is when you find something you like really well just to have it disapear. But for me and my sister we won't miss it.