Adafruit Small-Size 26-PIN GPIO Perma-Proto Raspberry Pi Breadboard PCB Kit
This is the very last one! NOTE: 26-PIN GPIO ONLY
To assemble you simply solder the 2x13 pin header in. The board provides all the labeled breakouts with a lot of prototype space, with power rails, and has mounting holes to permit permanent mounting on your project.
The metal is gold-finished so you won't have oxidation issues. Please note this only works with Raspberry Pi that use 26-pin GPIO.
This is a really great product and you should go visit Adafruit web site to get the full description and really nice pictures.