For the brave souls that want to solder the
Hall-O themselves, there is a Hall-O DIY kit.
As with all Hall-O : There is a small magnet in the bag, so be careful when you open it.
If this is the first time you solder SMD, you have chosen a nice project to begin with.
After this one, you too will agree that soldering SMD is easier and faster then through hole.
Here is the page on the RepRap wiki, on how to do it.
Click on photo below to get a tutorial on how to solder the board.