I live right near a Shell that sells the racing and it's out of stock about 80% of the time anyway. Also since they use ethanol to up the octane and it has much lower taxes it should actually be cheaper than the 98 but it's not so they are ripping us off. Another thing to note is that the petrol stations buy vpower at 4 c/L more than 91 octane and yet they sell it for 10 c/L more.
Also, what everyone else said about them not selling it near places that would have high use. I just don't get what they're playing at.
All that said, my last couple of track days I filled two Jerry cans and took them with me. Did the job.