Your commentators are correct - the $2 launch SIM card is being retired and is in the process of being replaced by the $5 SIM card, which comes loaded with $1 of credit.
The $20 SIM card remains unchanged - $20 for $20.
DjShadow: $25 per gig? :)
chriskeall: 2degrees told NBR the data increase was a typo (I guess of the kind where you meant to type 50 cents, but you slip and type $1). Sim card price is going up.
chriskeall: And people who read NBR but would never visit Geekzone got to hear about it, with a nod (and link) to Geekzone members for spotting it. I'm okay, you're okay.