
http://www.teefury.com/ - a site that sells a different art/pop culture/parody t-shirt every 24 hours and for 24 hours only, has a Dune shirt today.
I've bought a fair few shirts from this site in the past, the quality is good (proper screen print jobs) and I've never had any problems with the shipping from the US.
14 hours left... then it's gone!