depends on how hardcore of sticker you want.
one colour stickers are real easy, any printing company can make pretty much whatever you want and alot of shops stock them.
i have a vinyl cutter that is made specifcally for making those kind of stickers.
multiple colour printed pictures are a different story. still wasy to make, maybe a bit more expensive and bit harder to get your hands on full custom jobs. still, printin companies do them.
most windsurfing/kiting shops should have some big ones of the brands they stock, ask next time.

Our printer does full color vinyl printing for $100 per square meter, no setup cost, whatever you want on it, full colour, photos, graphics.....

The printer itself is like 1.2m wide so you can have 1.2m x however long you want!

If you just want single color, go to Rosey. He will be heaps cheaper.

yer, just go to a sign shop for the one colour ones like rosey's talkin about, you can get what ever you like, in one colour. or get him to make you some and send them down..