Do they have a gift shop in 9/11 Memorial & Museum

Yes inside is a gift shop and in the square there is a cart where you can buy souvenirs

Yes there is a gift shop in square

Yes, there is a cart out of south tower. And gift shop in 9/museum.

Yep

Yes, there is a very nice gift shop with very useful/significant items.

Yes there is a gift shop

Yes , all over

Yes inside the museum and also cart outside in the square between the memorials.

Yes

Inside the museum, yes. And there are kiosk-like shops on the grounds of the memorial as well.