I picked this up for $99 on Amazon:
[VIDEO]http://www.amazon.com/Hartke-Bass-Attack-Preamp-Pedal/dp/B0002OS9FC]Amazon.com: Hartke VXL Bass Attack Preamp Pedal: Musical Instruments[/VIDEO]
And after about a 10 minute test run I really like it. It's cheap, plain and simple, and has a dedicated DI out which is awesome. The "harmonic control" is pretty neat - it's supposed to be some kind of tube emulation, but to my ear it adds a little grit to the tone, which is exactly what I want for the way I mix stuff. It also has a parallel out, so I can send the DI and the normal out into my DAW, and send another signal to my wedges for jamming along with what I'm recording. Pretty damn cool for $99!
The Bass Attack provides a HARMONICS control for adding overtones, which produce a tube like tone. The HARMONICS control allows you to add a little warmth to your sound, or dial up com- plete distortion for a radical roots rock sound. When using the Harmonics circuit, keep in mind the BRITE control is turned on with the HARMONICS (using the ON/OFF footswitch), and will affect the sound. The MIX control is also active to adjust the balance between clean and effects.