I just got back from Asda (went to get that Green&Blacks spread at 50p!!) and they had quite a few of deals on outdoor patio things such as the ones mentioned in the title at £30 each. They were all near the entrance and in the outdoor aisle.
There was plenty of stock and everything was displayed properly, with printed prices and posters etc., so unlikely to be store specific.
They also had other deals (e.g.4 seat patio set) at various cheap prices, which I can't remember.
Sorry don't have photo to prove but if someone get's hold of one please post.
*this photo is not an accurate representation of the actual items*