yeah they do,
Best option unless you want to spend $2k is the same one I have
http://www.welding.com.au/equipment/view/weldmatic-190
big, tough, easy to get parts for (Bernard torch on it)
$1000inc GST and its yours, can supply a nice trolley for another 180
To setup for aluminium you need a Teflon liner and the right gas. will do up to 5mm aluminium with everything cranked up