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Evil Mad Science has the Diavolino, a low-cost Aduino-compatible board.

It's a low-profile through-hole version, with a simplified design. It's based on a ATmega328P microcontroller, and comes pre-flashed with the Arduino bootloader. Open source design, with bare basics hardware.

Diavolino is sold as an easy to assemble "through hole" soldering kit. Basic electronic soldering skill is required, and you provide the soldering tools: a soldering iron and solder, plus small wire clippers. Assembly time is typically 10-30 minutes, depending on configuration and soldering skill.