I expect you're likely located in Canada and so this won't help much, but unlike the Canadian central bank, the Reserve Bank of Australia has cashiers where you can obtain new, uncirculated notes of any denomination at all times. I exchanged some notes when I was in Sydney about two years ago.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.