I popped into B&M at lunchtime to buy a couple of packs of Segafredo coffee, and the security man asked me if I would like a box of Typhoo teabags for 10p. When I said I would, he asked me how many boxes I would like. I took 3, one for our house, and one each for my daughters. He said that they have loads of them but they're not putting them out on the floor as "somebody would want to buy the whole lot to sell on ebay". So fair play to him.
I'm not sure if they are local or national, but almost everything they sell is available nationally.
Not a bad price for 300 teabags.