If we can discard the name for a moment (which is just baggage), Pegasos and MorphOS are currently available. And before anyone goes flaming and saying that's not an Amiga, neither is a PC running UAE. And I'll tell you something else - it runs PPC and Warp3D applications, it doesn't cost the earth, and it's a lot faster than UAE on any machine.
If you discard the cost from the name alone, and application development (warp 3D) it's only natural that as a clone you get it cheaper, but still is away from the real thing...