You should check out the "Boogalook" T-Shirts, they sell through Ebay. Just do a search for that word. The shirts are brand new and have a nice vintage look.
They have a big selection of roots reggae shirts and the service and prices are great too. Warning: you'll probably want them all!
I love the Wailers shirt with the heads of Bob, Bunny, and Peter, taken from the Burnin' album cover. Nicest Marley shirt I've seen.