The only place I've found them was a cart by Honey I Shrunk... I've never been able to find them since. The very next day we went back to get another but the cart was gone and we've been searching since.
We got them twice...once in Epcot at a cart between Mission Space and Test Track and once at MGM, I believe it was at the Dip Site near Echo Lake. Also, in addition to cream cheese--my sister's favorite, there is also spicy cheese--my favorite, and apple cinnamon--also very good!
I had one of these yummy concoctions when I did solo EMH at MK Jan 03(DH,DS chose to hit DQ that day). I ate at the stand near Dumbo and the coffee was horrible, but the pretzel was great! Gave me the morning energy to keep touring after the park opned up to the rest of the folks.
Connears
I had one at Min and Bill's Dockside DIner in MGM. I had a choice of apple filled, cream cheese, or spicy cheese. I took spicy cheese-much too spicy! Looking forward to going back to try the cream cheese one, good soft pretzels.