At my new shopping startup, Giniji, we are soon going to start selling pre-installed Ubuntu laptops.
System76 sells their own linux laptops in the US. But we have always struggled to find alternatives in Europe.
So, we've ourselves decided to offer reasonably-priced second-hand laptops, that come pre-installed with Ubuntu. Most of you are perfectly capable of installing OS's on your own, but it's to save you time and effort, and also make Ubuntu laptops more easily available to the wider public.
We're starting off with Europe only, but maybe if there's demand we'll consider the US too.
If you're interested, please sign up here -
http://www.giniji.com/ubuntu_laptops.html.