Gollihur has brand new wood bows for $150 or so - that would be a fine place to start, IMHO. I've had nothing but very good dealings with them. Here's a link: http://www.gollihurmusic.com/product..._BASS_BOW.html
You can also just look at used bows here - used bows in that price range come up pretty regularly.
And although I should probably say this first, you need to decide on whether you're going to bow German or French. And make sure you have a mirror you can practice in front of - start every day with bowing open strings and trying to keep the d@#$ thing moving straight sideways over the same spot on the string.