Buying Jetboil Fuel enroute from Melb. Airport to Apollo Bay

I will doing the Great Ocean Road in September and am trying to work out some logistics.
The plan thus far is to fly into Melbourne Airport arriving 9.20am, hire a car, drive to Apollo Bay and begin the walk at about 1pm. I'm after the quickest/most convenient place to buy a couple of 230g cannisters of jetboil jetpower fuel enroute, ideally without the need to go into Melbourne CBD.
Cheers
The plan thus far is to fly into Melbourne Airport arriving 9.20am, hire a car, drive to Apollo Bay and begin the walk at about 1pm. I'm after the quickest/most convenient place to buy a couple of 230g cannisters of jetboil jetpower fuel enroute, ideally without the need to go into Melbourne CBD.
Cheers