Link: http://www.banggood.com/Wholesale-New-OEM-Car-Charger-+USB-D…
Just noticed a 50% coupon for items listed under "Automobiles & Motorcycles Clearance" - coupon code "BGcar" - expires 2013-12-30
Posted this deal here as it states that there is only 7 left.
Details of the item
New OEM Car Charger + USB data cable for iPhone 4
Package Included:
1 x Universal USB Car Charger Adapter
1 x USB Data / Charging Cable
From the images it looks like the output is 5V, 1amp
On eBay it is selling at AUD$2.84 - you can see the complete eBay list here
Hope someone finds this useful.