You probably found this. Thats the only company I know of that makes full port replicating docks for the Mac laptops.

Beyond that, you can look for "universal" docks to just set the laptop out of the way. What the universal ones tend to do is have a USB cable that plugs into the laptop, then the dock has an internal USB hub with a USB sound device, sometimes USB ethernet and such that your system will see as separate devices.