BrewDog Punk IPA 4 x 330ml at Tesco (Clubcard) or Sainsburys (Nectar)

Less than half the usual £6.50 price.
The 4 x 330ml pack gives you 1.32 litres of Punk IPA. At the loyalty-card price, each 330ml can works out at 75p, compared with £1.63 each at the normal £6.50 price.
Price breakdown
Nectar price: £3.
Regular price: £6.50.
Saving: £3.50.
Discount: 53.8% off.
Price per can: 75p with Clubcard or Nectar.
Regular price per can: £1.63.
Loyalty price per litre: £2.27.
Regular price per litre: £4.92.
Why it is a strong deal
This is a genuine buy-on-offer product: the £3 loyalty price is less than half the regular price and gives you four branded 330ml cans for less than the price of two at the standard rate.
The main difference is simply which loyalty scheme you use:
Sainsburys: Scan your Nectar card or app.
If you have access to both supermarkets, the price is identical, so choose the more convenient store or include the beer in an existing shop.