Depends on if you're looking for new or used/vintage basses. The new stuff should be relataively easy to find through dealer and websites. However, the older stuff can, as was mentioned above, show up ANYWHERE. For older instrumetns, you might try buying an issue of Vintage Guitar magazine. There are a lot of listings for guitar shops that you probably wouldn't otherwise know of or think to check...since they deal with more guitars than basses. Just a thought.....
