AUD/NZD spreads

I know cross rates are the way to go to play this. But I do currency futures. So, to that end, is there a good research place or house to find historical data on the spread between the AUD and the NZD?
 
Quote from Trader KGB:

Just the price/cross-rate. Do you need the historical bid/ask spread or interest rate differential?

Looking for the differential between the bid/asks or even lasts of AUD/USD and NZD/USD.
 
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