The acrylics are flat, the acrylic enamels are gloss.
There are actually several brands, they all come in the same size/type of plastic squeeze bottle, and they're all on display together in the same aisle. At my Hobby Lobby the brands they have are Anita's, Americana Acrylics, Americana Gloss Enamels, Craftsmart, Folk Art Acrylic, Enamels, and metallics (I think there's another brand that also has metallics).
But once you find the right aisle, you'll see them all there on one giant display rack.