Good things come in small packages.

Here is a nice little class D 20 watts x 2 @ 12v amp board.  It is made by Adafruit Industries and available locally from BC Robotics.

This thing is awesome for its size, perfect if you need nice clean and loud audio but are limited by available space.

I will be using this with a raspberry pi and a few other components to build a wifi audio streamer for the MakerSpace.