I was out on Saturday looking to buy a drill/driver + impact drill combo.
To my surprise I found a great kit at Total Tools - Preston
The Kit includes:
x1 Bosch GSB 18 E-2 LI Destroyer II - Drill/Driver & Hammer Drill
x1 Bosch GDR 18 V-LI - Impact Driver
x2 Bosch Li-Ion 3Ah batters
x1 Charger
x1 L-Boxx Small 136
3 Year Warranty

Paid: $469

This is cheaper then anywhere I have see, even in the USA. These are the top of the range New Bosch 18V drills + drivers. Not sure how they could sell at this price. NO ONE could even match this price (Bunnings, Masters, etc...), given that the Destroyer II retails for $499 and the Impact Driver retails for $449. They had about 10 sets, not sure if they had more out the back.
Please note that I am not affiliated with them, just a happy buyer/woodworker.

The kit is not a standard kit but a Bosch promo. Please not that usually the Impact Driver usually comes with a smaller 1.3Ah battery. At least that is what the Bosch catalogue shows.