Marketplace
Clearance sale for these extension leads. Not sure if this store specific or country wide.
I don't think there was any actual difference between the 15m "home office" reel and 20m "heavy duty" in terms.of construction or rating.
Similar to this:
https://www.bunnings.com.au/cordtech-25m-heavy-duty-cable-re…
Unclear whether better than this deal, but certainly cheaper.
https://www.ozbargain.com.au/node/823171
I got one at Vermont South Bunnings 15m $10 yesterday