Morrisons Tea Bags are half price at the moment and a very good deal IMO.
Extra Strong are £1.69 for 160 bags. These are not bad, certainly not the strongest in the world but a good flavour and good value at 1p a bag.
Red Label are £1.12 for 160 bags. If you like weak tea or at the best medium weak tea then these are super value at the price. Not for me but we like different strengths of tea in this house and I'm told they are good.
Decaf are 91p for 80 bags. Not tried these but added to the deal for reference.