Typical price for 100mbps is $89, these guys are currently advertising $79 with no apparent deal or time limit. No lock in.
I've used them for years and highly rate their customer service. Have always had good speeds. TPB is still unblocked lol.
For reference they seem to be the same company as Mate Communicate and resell the the vocus network.
Looks like Mate has matched the $79/month (also a Vocus reseller). It has also reduced uploads to 20Mbps. https://www.letsbemates.com.au/nbn/