I hate to bear bad news but for less than $150 you aren't likely to be able to find anything of use beyond a practice amp. As others have said, for live performance you need power, and as a general rule more power means more money. I suggest you shop around for something used (but not abused) and plan to add a few more dollars to your budget. Even in small places you need power to push the lower frequencies of bass through the mix. Low power bass amps have to be cranked up to get enough volume and tend to get muddy sounding (distortion is not usually desireable on bass) also a more powerfull amp doesn't have to be turned up when you are in a smaller place. In general it is much better (especialy foe bass) to have more than you really need. I don't know any bass players who use less than 150-200 watt amps for live gigs, even in really small clubs.
