This is quite cool...and affordable too! But how did u do the surgery? Or does the price include surgery done by them.
If you bring your camera to Orient Photo, I am sure they will not hesitate to install the split-prism screen for you. However, try to go there during 'off-peak' hours such as a weekday morning (they open at 10:30am).
To install it is not difficult, just tricky. You'll need patience and gentle hands.