Do they sale the pop up cell phone holders?

Near the front, they sometimes have them in the place you'll see candy and the gimmicky stuff, like fidget spinners.

Sometimes

Some. As much as Walmart.

I have seen the pop its but not the holders

I have had better luck with Staples or Office Depot in their front bins. But you may find them at Michaels, too.

It's hit or miss. I have seen them in there before but realky haven't paid attention to see if they still do.