It means that the little guys on K-Mex (dressed up in the bee costumes) have partied with this particular piece of equipment. They go through a lot of gear.
Also on occassion they are actually new units that are being cleared out to make room for a new model. In these cases B stock units usually have a shorter warranty period which lowers the company's future warranty repair costs, so they can reduce the price even further to clear them out faster.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.