ASDA have all of the new 2021 and any remaining 2020 Mix Tray Polybags for just £2.50 at the moment. There are 5 from the 2021 selection from themes such as Friends and Speed Champs
This was at the Worcester store, they didn't have too many of the Friends, Ninjago or Speed Champs ones left and I couldn't see any Creator ones sadly but plenty of the City ones - I wonder why . Tesco have these at £3.50
Here are 5 too choose from, though note stock may vary by stores, more popular ones might be gone before less popular ones.