For those due for a speed upgrade next month (FTTP and HFC), Leaptel appear to have updated their 100/20 plan to 500/50 plan a few weeks early. As an existing customer I was able to switch to 500/50, from 100/40, and also get $10/month off. I was coming from 100/40 at $89.95/month ($10 off/month), I moved to it recently as it had a $10/month promo and was cheaper than my 100/20 at $92.95/month. You probably won't get the discount if you were already on 100/20, but you will at least get the speed upgrade a little early for your $. Let me know how you go below.
https://members.leaptel.com.au/services —-> details ——> change plan
NBN M2M - Fast (Unlimited) 500Mbps / 50Mbps $92.95 $82.95
For new nbn FTTP and HFC users, the nbn plans are showing 500/50 at $79.95/month for 12 months, then $92.95 thereafter, for the 'fast' 500/50 plan.
https://leaptel.com.au/nbn-plans-page/
Some other OzBargainers on 100/20 got a discount and 500/50.
https://www.ozbargain.com.au/comment/16789036/redir