Still in stock at some Dick Smith stores, eg Rosny TAS has two. Compatible with Samsung ML-1610 and ML-1615 printers. $19 is excellent value for an original toner cartridge, eg they're $133 at Officeworks.
The DSE stock number is XM0851 but they're no longer listed online. Try asking at the local Dicky's if you need one. Similar deal, at $20, previously published 6 months ago* but hopefully this'll bring a few more cartridges + printers together.
*aa1320 on 26/04/2012
http://www.ozbargain.com.au/node/68740
If you wanna save 5%, head to Officeworks and price match it ! lol
http://www.officeworks.com.au/retail/products/Ink-and-Toner/…