I had a look through the expired promo codes on OzBargain and noticed that the shop-a-docket codes are sequential.
Currently, MET181 gives a 15% discount. If that doesn't work, try REG1710 or VIP15 instead.
Note that orders over $50 include free postage (below that it's $6.50).
Generic ink on eBay for my printer (Epson xp-245) costs less than $20 for the set. This site offers generic inks for over $35 for the same thing.
Would love to know if anyone has bought from here and there generic quality is better than generic from eBay.