About six months ago, they merged the two sites and made a bunch of pro items (like eyeshadow pans and paint sticks and certain brushes) available to all. But there are still a few pro-only items (which you can only see if you're logged in with a pro account). The Acrylic Paints are one of these.
Acrylic Paints are $20 each, intense, long-wearing (12 hours), flexible, buildable-to-full-coverage, blendable-over-hair, silicone-based paints for face and body. You can stand up, sit down, move, bend, dance around, and they won't crack or crease or flake off. You can apply them with brush or airbrush. The MAC website has a video of acrylic paints being used to paint people into statues .
These shades can be used everywhere: