These agents either book freighter voyages exclusively, or freighter bookings are the major part of their business. If you travel alone, always try to book a single cabin. A single booking a double will always end up paying a higher fare. Sometimes this can not be avoided.

I personally use the agent listed below to book my voyages. A phone call to London will only cost 46 cents plus 3 cents a minute if you dial 10-10-987 44 (area code) and number, which is listed at their web site.