Costco is clearing the iMac 21.5" 2020 models .. Possibly to make room for the new iMac 2121 models
Price is including Delivery.
iMac 21.5 Inch 2.3Ghz i5 256GB MHK03X/A $$1,396.97 (Retail $1599) Link
iMac 4K Retina 21.5 Inch 3.6GHz i3 256GB MHK23X/A $1,596.97 (Retail $1799) Link
iMac 4K Retina 21.5 Inch 3.0GHz i5 256GB MHK33X/A $1,896.97 (Retail $2099) Link
JB Hi-Fi is also having 10% Mac sale at the moment but Costco price is still cheaper.