Welcome123h
Received an email from TomTom about a map promo they are running till 17th of June.
Buy any map from TomTom and they will send you a $50 Lonely Planet voucher. Checkout http://shop.lonelyplanet.com for the range.
The lonely planet online store is fairly overpriced but this is still reasonable value if you require a Australian GPS update anyway/are planning to travel with your GPS.
Update: I successfully used the coupon code Welcome123h for a further $20 of the cost of a map.
Don't use my Tom Tom now as my phones gps is up to date and Tom Tom want $100 to update to a map that can then be updated itself. Apparently my map is too old for add on updates.