As you are mostly interested in AUS I have 55,633 races where I have TAB prices and betfair prices. These are TAB prices at 10 seconds to jump and not final prices. You never know final prices when you are placing a bet therefore I don't bother keeping them. I only record them for selection filtering and not analysing a return as its far less than betfair numbers. I did it for a while and decide it was not worth the bandwidth.

I store Fixed Prices as well. For betfair I store exchange prices just before the jump and betfair SP. I also have prices from periods before the jump but not for all of the records.