Folk Art, Apple Barrel, and Americana are all decent brands of craft acrylics. The arts & crafts stores Michael's, AC Moore and HobbyLobby also sell them.
As was noted, they are thick, but you'd normally thin them for our application. I do find that they are grainy as well, something no amount of thinning will address. The pigments used to make them are not ground as finely as in acrylics made specifically for figure painting and scale modeling. However, they're cheap, and they're good for covering large areas, or for weathering and for diorama work. You can use them to pre-tint ground material, for example, mixing them in plaster or Celluclay, or similar materials.
It doesn't hurt to add them to your paintbox.
Prost!
Brad