Hey all, just to share with your my experience so far ...
I went to Harvey Norman as advised by some of you - true enough they do 3R printing. There's a self-service kiosk you can use to upload your pictures (memory card, thumbdrives, bluetooth etc). Cost is 40 cents per print. Cheaper if you sign up as a member.
However, I found that No.1 Colour Center does it for 25 cents!!
But all of them just print on regular 4R paper then cut it down to size.
My conclusion - get your own 4R photo paper from Challenger or Popular (5 bucks for 30 sheets glossy) and buy a pair of scissors! Cheaper