It's ungrammatical, but I'm not sure even that is wrong. It's almost expected in the context of handwritten signs on greengrocery. Could we consider it a form of market-specific dialect?

It's not as though it is likely to cause misunderstandings.

I used to fuss about punctuation, but nowadays I am more inclined to revel in having a brain so well formed that can easily process a sentence despite anomalous punctuation, in several different ways, and make a joke about it - with no inclination to fall over and spout error messages. grrr.