Project 122 from Elliott Sound Products is a very small and simple, “utilitarian” microphone preamp.  The circuit is based around a single NE5532 opamp, and provides 37dB of gain in its standard configuration.

Notable Features:

• PCB-mount potentiometer and XLR input jack
• 3dB/octave rolloff at 104Hz
• Extremely compact design

Price: $18 for PCB

More information at ESP’s website.