System 76 is giving away ubuntu stickers! Follow This link to get some. All you do is send a self addressed stamped envelope to system 76, and they will send it back with your stickers. I tried this, and in a little over a week got my pack of 4 stickers.
Update: It appears as though the are no longer offering this. Oh well…
It's a shame this deal is no longer available. For anyone interested – there are now several online stickers retailers who will produce customised stickers at next to nothing in price. I've been searching for a similar deal to this but thus far have come up empty handed.