80 bags of Clipper 'Organic Everyday Tea', 71p.
This was in the Sainsbury's Local on Linthorpe Road, Middlesbrough. It isn't showing on the website at this price, so it might be store specific, or 'Sainsbury's Local' stores only. The shelf edge label for it displayed that it was £2.55, and now £0.71. Didn't get a receipt so can't post that.
EDIT: Have now added proof to the comments.