I was shopping at my local Woolworths store and scanned them for $2.80 each and so I bought a couple more. It said promotion on the screen. The other frozen meals of Mr Chen's were still full price at $7. Could be price error, could just be at my store. Mixed reviews online and appears only to be in person, (not available online).
Edit: BBQ PARK. Thanks Tomgum
Receipt Photo: https://files.ozbargain.com.au/upload/262199/84505/img_20201…
I like to BBQ at the PARK too…