The picture below shows the lowest bottle prices excluding VAT taken from http://www.wine-searcher.com today for a few major shippers in the generally declared vintages from 1980 to 2007. The prices may or may not include Duty.
Discuss...
"The first duty of Port is to be red" Ernest H. Cockburn
interesting chart! As expected Taylor & Fonseca command the highest prices (generally speaking), but I'm struck by how closely grouped the other shippers tend to be (with an occasional spike here and there.)