http://www.airsupplies.co.uk/blog/competition-win-bambi-bb8-silent-air-compressor/ I saw this contest to win what seems to be a fairly nice compressor for airbrushing, linked from a 40k blog.
I emailed them and they confirmed that it's open to EU and US residents. Conveniently for me, I got an airbrush for Christmas but haven't picked up a compressor yet.