Cheapest GBK discounts, deals & offers on sale
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Gourmet Burger Kitchen, 2 Aberdeen Angus beef burgers was £4.49 now £2.99 at Waitrose (342g)
Free GBK Lunch with the app, see photo :)
Best ready made burgers you can get. Check out the reviews at Ocado. These are usually £4.49 and occasionally on offer at 3 for £10. So £2.99 is the cheapest I've ever seen them.