http://www.ebay.com.au/itm/262345097832?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Hi Norm,
yes not a bad idea. Wait for a special at Repco or SCA, you may get it cheaper?
If you already have a battery charger (and pump and torch, etc), what about a cheap 12Ah SLA or motorcycle battery or even car battery? Usually a 7Ah SLA inside those starter packs (if not smaller) anyway. Just an idea...
Also having seemingly rubbished the jumpstarter which I actually own, It's actually convenient, useful, well built, just about fits in a large pocket, has a torch, double as a large mobile phone battery/recharger- same as Officeworks "power banks", USB output incl a higher (2.1A) port. But it won't pump up your tyres0- I hope that doesn't leave you...a little deflated?

Cheers,