Hi Belinda
We got our portable pump from the US off Ebay. We have since passed it on to another family. PADP we were told, would not supply a portable pump under any circumstances. This is clearly a stupid and isolating policy that needs changing, but there is only so much time in the day for battles, it is not one I have taken up with them.
As an ballpark figure we got a Kangaroo PET pump with a backpack and 50 bags for about $180 including postage from Alaska. You should keep your eye out. We were able to give back our pump to PADP although that messed with their heads for a time as to why we still needed bags - ugh. When it arrived we opened up the electrics and found they have a dual transformer inside so my dad (elec.engineer) was able to simply switch it over to our Aust power requirements and replace the plug with an aussie plug. honestly, it is life changing to have a portable pump.
Another idea if you have no luck is to get a power adapter for your car it plugs into your 12V socket in the car and has an normal Aussie Power tranformer plug outlet so then you could plug the 'non portable' pump into the car if that helped at all.
At the end of the day we just went to gravity feeds which my son liked better. I am still trying to find/develop a better method for that and have written to some manufacturers in the UK who might have some clever insights for me.
Good luck
Gina
sandgburns@bigpond.com