If you purchased your device in Australia it would be worth trying the retailer first, you never know. If approached politely many will aim to please.
Also be aware you have rights under "statutory warranty" in Australia, you could argue a device worth $120 or whatever you paid should be good for more than 2 months beyond Kobo's written warranty period.
http://www.abc.net.au/news/2011-06-0...rights/2749924
Edit: link added