Larger stores stock 13" Touch Bar with 3.3 GHz i7, 16GB, 512GB, and 15" Touch Bar with 2.9 GHz i7, 1TB, AMD 460.
Not sure about the nTB.
If the person you ask says they don't stock it, ask them to double check - every Apple Store employee I've encountered was unaware they stocked high-end models.