So where can you get it? -  V-Power Racing (100 RON) has been phased out since July 2008.
 
What is the difference between Shell V-Power and Shell V-Power Racing? 

Shell V-Power is a 98 octane fuel designed to improve the performance of many modern engines. This is aided by Shell V-Power’s Friction Modification Technology (FMT), which is formulated to reduce friction between the cylinder and piston rings, a critical area of the engine where lubrication is difficult to achieve. FMT is designed to help the engine turn more freely, and so help transfer energy from the fuel to the wheels more efficiently.

Shell V-Power Racing has the same engine cleaning properties as Shell V-Power but is formulated with 5% ethanol and is a 100 octane fuel.
 

There's an independent servo near Parramatta that sells 100RON fuel from the pump. I'm not sure where they get it from though (Shell, BP etc)

i was told that theres a shell outlet in vic moorabin thats sells the shell racing fuel
not sure on other states
 
its all a hit and miss unless i go there and confirm it i cannot guarentee it.
i went to the places that supposedly sells e85 and they stopped getting it last year due to no supply from NSW which is where the victoarian guys get it from.
ive been told of another place to get E85 iil see if they have it or not.
 

http://apps.nowwhere.com.au/caltex/locator/?&type=caltexall
Try the Caltex locations in your state by checking the E-flex box & entering your post code.
 
 

For a race car, buy E85 in a drum!
 
Pump fuel will vary the ethanol content depending on market, weather ect also the other unleaded part will vary fron 91, 95, 98 ect
 
From caltex: When Caltex retails the fuel, it will include between 70 and 85 per cent ethanol blended with regular petrol, depending on the time of year. 
 
All good drum E85 will be 85%ethanol and 15% 98 fuel mix
 
Also a drum is sealed and will store for ages, servos it wont last long at all, its vented to the atmosphere, ethanol mixed fuel can absorb water from the atmosphere about 50 times more then normal non alcohol fuels, less then 1 tablespoon per gallon of water will spoil the fuel and start separation, as water will not blend with petroleum 
 
So i wouldn't leave it sit in the tank either, drain, fill with 98 ect, run the car for a little, then fill up with fresh E85 next track day.
 
Few places around, for example race fuels in Melb you can bring your own drum and fill up with good race 'drum' E85, obviously cheaper then buying drums from places like vpw, rocket ect, saves cost of the drum, couriers ect.

^ All good points
If your planning on running a blend though, I wouldn't be too worried about any variations in the E85, particularly the base petroleum component as your only looking at 15% of 20% (3%) of your total fuel. Also the Ethanol content in a 20E/80(98) is, going on calculations, going to give you considerably over 100 RON, so any marginal drop isn't going to drop that significantly.
With the moisture absorbtion issue, the tanks are supposed to comply with EPA standards and only vent under pressure, much the same as your fuel tank cap does (should) so hopefully that's the case..

"Ethanol RON 129, Methanol RON 123"
So by my calculations good E85 should provide 123.3 RON on its own.
So, that mixed with 98 should definitely be well above 100 RON!
 

so maybe even a 90/10 mix might be all you need
can someoen here work out the exact ratio to make close to 100 ron
that would be awsome
the less E85 used the safer for the fuel lines - internals etc if **** hits the fan

Definitely worth looking at. Experimentation seems to be the key at the moment.
Only thing is, if your cutting the Ethanol component, your also loosing the leaning effect it has on the AFR, particularly the gen2, although both would be affected to some degree.
As I see it, the power increase is coming from, and proportional to, a number of sources. Leaner more combustible AFR's (under boost), better VE and exhaust flow (quicker spool), lower combustion temps and naturally higher octane to support this, not to mention the now useable timing curve.  Also the 98 content is significant because it's the base source of energy given your running the same volume of fuel, so you don't want to cut it too far.
The gains I've experienced so far with this stuff are far in excess of the old Shell Optimax (100RON) and it's 5% Ethanol, so there's more gains than just the 100RON.
We really need to get one of these on a dyno and run a few tests to see where the limits are.

wow so its better than the 100 ron shell fuel i was thinking of giving that a go
iil have to hunt around for a E85 pump near me
ive got a few from the list you posted but few dont stock them anymore
keep looking i guess