There's a torrent on btjunkie with 1113 seeders.

Also, Amazon.com: 28 Days Later (Widescreen Edition): Ray Panthaki, Lisa I'Anson, Brendan Gleeson, Danny Boyle, Naomie Harris, Christopher Eccleston, Alex Palmer, Bindu De Stoppani, Jukka Hiltunen, David Schneider (IV), Cillian Murphy, Toby Sedgwick, Noah Huntley, Christopher Dunne, Emma Hitching, Alexander Delamere, Kim McGarrity, Megan Burns, Justin Hackney, Luke Mably: Movies & TV@@AMEPARAM@@http://ecx.images-amazon.com/images/I/511KHM89SFL.@@AMEPARAM@@511KHM89SFL

I know buying is uncool and everything, but it is dirt cheap.