Ok, no idea if this is national but it has to be worth checking your local store for this. Tonight I got 2x Olive Trees between 5-6ft tall half price (were £20 - NOTE THESE ARE NOT THE ONES THAT WERE 2 FOR £20, THEY ARE TWICE THE SIZE!). Fantastic price AND I managed to get them home all on my own in my VW Beetle along with my son and a boot full of groceries (takes a bit of female logic lol).
My local store is Tesco Ystradgynlais (South Wales, Swansea Valley) so if you are anywhere near i'd say they had around 20-30 trees left. And as I say, well worth checking your local store to see if they have them OR ask the friendly people on their Facebook page to check for you!
HTH some of you anyway, i'm really pleased with my purchase :)
p.s. they were being announced as reduced while I was instore, so I think this reduction has only just taken place today.