Just wanted to share a source for the OEM ATF Esso LT 71141 ATF fluid that our trannies are speced for. JIE sells them for about $12.50 per liter . They bottle it themselves since they order the fluids in large drums.

Being the FANATIC that I am, the corresponding AUDI part # is G 052 162A2.
I purchased this at World Impex for $14.37 per liter. This is *pre packaged* from Audi so I'm hoping the oil is 100% clean - no user error contamination

Hope this helps for fellow maintence freaks.