SMS ‘Rewards’ to 193 000 (free for Virgin mobile to SMS) to register. Then get 20% bonus credit every time you recharge your Virgin Mobile number online.

For only $30, you get a cool $100 worth of Optus mobile call time with a $100 Optus PrePaid Recharge card from AlwaysonSale.com.au

Optus is running a 10% off recharge off prepaid cards.
Credit card transactions only.
No limit to number of recharges online during the promotional period ($300 maximum MyCredit balance applies).

Kmart’s offering 10% off all mobile recharge vouchers for 3 days only - 4 to 6 January 2007.