Current rate still applies until 1 January 2020 when the stamps go to $1.10 (which sending a large letter will then cost $2.20, $3.30 or $5.50 depending on weight).
Personally I don't bother with tracking on anything under $20, all tracking does it put you out of pocket more than the once-in-a-year $2 item that goes missing, and no buyer will pay more than the item's worth just for postage unless it is priced too cheap or it's rare/collectable. Basically it just keeps Australia Post's profits rolling in, just like forced Parcel Post on non-letter-rate media and 50c priority labels. If a million people use those 50c labels, there's $500000.00 Australia Post gets for free, just like the Colesworths 15c bag farce.
