The last time I saw an authentic Slush Puppy machine was in 6th grade. We had one in the lunch room. Everything since has been some sort of knock off at 7-11 or Circle K.
I don't know if they have Parrot Ice machines in California, but if they do (normally at Chevron) I'd suggest getting a cup of that syruppy goodness.
I'm more of a fan of the Icee personally, especially sprite ones.
These days I just drink alot of green tea and water, healthy stuff