Artists such as Eboy, Massimo Vignelli, Jon Burgerman, Dalek, Steve Simpson amongst others have posters on sale here -100% of the money goes to Haiti Earthquake Relief and you get a nice peace of limited edition artwork which is only a good thing.
The posters are available from the 'Poster cause project'. They're only $15 so you can easily afford more than one - What are you waiting for?? : http://postercauseproject.bigcartel.com/category/haiti-earthquake-relief-posters