Kitepower should be able to fix you up ...
I got mine direct from this guy in Menai, Sydney about 3-4 years ago (think he is the importer - pretty sure they are made in CHINA)... maybe he has spare parts for 'em ... have had to change the batt a few times (mine is only 6v tho) ... other than that, it has been great especially for pumping up larger size kites.
Standard ones are $199, deluxe (which I have) $299
www.islandinflatables.com.au/accessories/pump/island-inflator-pump (watch the vid. for info)
Those Ryobi One+ ones sound ok too ...