Help me out here, pls!

The Grammarly software correctly identifies a punctuation problem, but in doing so it overlooks a more basic problem with your sentence -- you have misplaced an important phrase.

It seems like you are trying to use "No more" as an introductory non-defining phrase. Such phrases are set off from the sentence by a comma. But a non-defining (or non-restrictive) phrase can be removed from the sentence without changing the intended meaning of the sentence. Let's see what happens when you remove "No more." --->

"A consumer can close his eyes and get a simple nail cutter."

This seems to have the opposite meaning what what you -- I'm guessing -- intended to say.

Let's try to reword your sentence --> "A consumer can no longer close his eyes and buy a simple nail cutter." Or, "No more can a consumer close her eyes and buy a simple nail cutter."

I hope my examples mean what you intended.