Behringer ADI-21 Acoustic Guitar DI, but works great for Bass (even has some suggested settings for it in the manual). I bought this stupidly overlooking using my SansAmp for the few times I need it for my guitar. Works great, just don't need 2 DI's. Only 2 weeks old and used once.
$27 shipped in the States.
Acoustic Amp Modeler/Direct Recording Preamp/DI Box
Analog modeling acoustic guitar preamp/stompbox with DI recording output
This BEHRINGER product has been designed to compete head to head with leading products on the market
Authentic tube/microphone modeling circuitry provides the natural warmth and presence, as if your acoustic guitar was miked through a tube pre-amp
Ultra-musical 3-band EQ with sweepable mids for accurate feedback control and to eliminate the harsh harmonics of piezos
Super-high impedance to retain maximum signal integrity and dynamics
Dual DI mode for either direct recording output with tube/microphone emulation or standard active direct injection box in bypass mode
Output available on ¼'' TS or balanced, gold-plated XLR connectors
Ground lift switch eliminates typical ground loop problems
Runs on 9 V battery or the BEHRINGER PSU-SB DC power supply (not included)
High-quality components and exceptionally rugged construction ensure long life
Conceived and designed by BEHRINGER Germany