In my opinion a very good deal. I was in Costco (Glasgow) today and they are selling a six pack of 2 litre bottles for £4.28. The bottles have 50% extra free. This works out just less than 72p per 3 litre bottle. They had tons of this. I'm assuming this deal will be nationwide. The price is inclusive of tax.
6 x 3 Litre Bottles of Dr Pepper only £4.28 inc VAT @ Costco = only 72p a bottle