Make you're own
Why not nip along to PC World and buy some 'Sticker-Paper'. I've found the best results come from the paper you put through a photocopier ( and you can get either B/W or colour photocopier paper).
The paper you put through an ink-jet doesn't seem to last as long, although if you get the clear film and reverse the picture you can make window stickers for the car..
The wife was so impressed when I did that last...
Doing it yourself will be cheaper and you can create your own designs/ logo's as many times as you want!