If one was short of time, one could always put out a tender so that several (hundred) different independent agents could speculatively contact them in order to

If one was short of time, one could always put out a tender so that several (hundred) different independent agents could speculatively contact them in order to conduct negotiations, then present you with offers that you could compare. If those agents were in turn having trouble establishing contact, they could farm out this effort to others who had more time and expertise in this area.