mophie have cut their prices for the Black Friday sales in the US - with free US shipping.
Before you read further - they only ship in the US, so this is only good to you if you have a forwarding service/friend etc that can send your device to AU.
juice pack air™ - iPhone 4: Was $79.95 Now $59.95 (25% off)
juice pack air™ - iPhone 3G & 3GS: Was $79.95 Now $29.95 (60% off)
The above are in USD. iPad/iPod Touch accessories on sale too.
Any recommendations on a reliable and cheap US forwarding service? My last guy had to terminate all services after the police knocked on his door because apparently a lot of his other customers were buying stuff using stolen credit cards.