Size 15 Wide width women's work in Australia
ASOS Australia
Online fashion giant ASOS has a huge range of shoes in size 11 AU. Plus many of their own brand shoes are available in size 12 or 13, with a few styles now going up to 14 and 15 AU too - all at affordable prices. While I found their size 11 AU true to size, I've had some feedback suggesting larger sizes run small, so you may need to size up. Free shipping with AU$80 spend & free returns on all orders. 10% student discount.
Meuz, New Zealand
Run by Meelz and Suze, Meuz (pronounced Muse) do fashionable wide fit flats, heels & boots in sizes 9-14 Australian. Foot lengths & circumferences are listed for each style so you can get your size right. The lengths looks generous, so some might fit up to size 15. Ships to New Zealand, Australia & the Pacific Islands.
Big On Shoes, Australia
Australian retail & online store with a wide selection of brands and styles available, including their own Jacob+Therese label. All sizes catered for up to size 16 AU. You can also visit their store in Moranbah, Queensland. Worldwide shipping available. Free Australian shipping with $150 spend & flat shipping rates for New Zealand and the rest of the world.