I run monthly auctions at
http://www.numisbid.com.au/ with a good selection of PCGS graded Australian coins. This month's auction includes a number of mint state florins including 1912, 1914-H (the key date), 1926, 1934 and 1939, shillings including 1926 and 1931, and half pennies dated 1918-I, 1920 and an MS65BN 1922. You can view the listings here:
http://www.numisbid.com.au/Browse/Australia/