If you're in need of some cheap mobile data from a disposable SIM card (e.g. Dual-SIM phone, 2nd phone, iPad, Kindle, Laptop) PB Tech is selling the Vodafone Prepay $19 Carry-over SIM card at $9, which is about half price. If you activate one before September 4th you'll get an extra 500mb of data, which makes for a total of 1GB. It also includes 100 minutes and unlimited TXTs.
Each SIM card lasts 30 days, so once it expires or you've used up all the data, you can throw it away and open a new one - unopened and un-activated SIM cards technically have an unlimited shelf life. Not quite as good as the $5 2Degree deal or $4 Warehouse Mobile deal, but still a deal nonetheless.
Be sure to use the code for free shipping.
Alternatively Noel Leeming and Parallel Imported are also selling the SIM cards at $10. In case PB runs out of SIM cards.
If you want a Spark $19 Combo SIM instead Parallel Imported has one for $10 with free shipping.
Does this work with same phone number?