I found a great guy in Canberra who did a fantastic job on my stickers and has very reasonable prices. See Jeff at addcolour - ph 02 6280 4106 or www.addcolour.com.au for a quote. They were half the price of anything I've seen on seabreeze before and he takes care of the artwork for nothing unless it's really intricate. He'll do anything you can dream up or you can let them give you some creative alternatives. It would be especially worthwhile to get a few people together as the price would be even cheaper (something to do with the size of a vinyl roll).
No problem to mail them either.
Here are a couple of photos of my new numbers.
and Dads sail number
last year with my Kai/Naish look alike