Went to Dub Vendor the other day, Tubby and the DREAD was there...
Dub Vendor is a merchant website - and one of the most iconic. They consequently praise the items they try to sell. Nevertheless, it is a real satisfaction to read their comments on Natty Dread magazine that we published from 2000 to 2010. They used to distribute some copies in London at the time, and I do remember that they sold several dozens of copies of the issue with Tubby on the cover, although written in French!
They are now distributing King Tubby - the Dub Master (DREAD Editions), and the book is already available from their website!