Bonds is having a 40 hour 40% off sale on their website.
Before anyone says "it's always 40-50% off at supermarkets", you won't get the range of that is available on their site, for example womens bras and underwear. For supermarket range, you're better off with 50% off at Coles this week.
I highly recommend their 'Sporty Top' bra which has perforated cups to keep you cool and are very long-lasting, wash after wash. My first one has lasted over 1.5 years with weekly wear and wash.
Look right now
Woolies 5pack of elastic briefs $13.50
https://www.woolworths.com.au/shop/productdetails/257599/bon…
Bonds 40% off have only a FOUR pack of elastic briefs for $16.17
https://www.bonds.com.au/elastic-hipster-brief-4pk-m8dm4o-pk…
Not even close