Being a fan of the TV Series LOST since season 1, I have scoured the net for some rare t-shirt merchandise before the series finale. I just bought Constant from Teefury featuring Daniel Faraday and Desmond Hume aboard a DeLorean. Cool eh? (as of writing you still have 30 minutes to buy!)
I also stumbled upon a cool blog by Coty Gonzales, a Filipino (Ilokano) who blogs and reviews shirts from around the world. He collated 108 Unique Lost Tees, some you can never buy because either they were sold on a 24-hour limit (ala Teefury) or because they have never reached screenprinters at all.