Are you interested in Arduino development, protoyping or hacking? If yes, you need ABRA's Arduino Development Kit as a low cost way of helping you design your very own Arduino shield.
Look at what you get for such a low price:
You get one single-sided phenolic board with copper solder pads and mounting holes. It's size of 3.2" x 2.5" (8.1cm x 6.3cm) is specially made for the Arduino Uno. Of course this board can be used for any electronic project.
You also get the headers necessary to connect your shield to the Arduino main board. They are the perfect height for clearing the USB-B connector and great for stacking multiple shields.
-one perf board
-two 6 pin female headers
-one 8 pin female header