They must add 50p on to deliver up to your Tesco, cos ours are £7 in local Tesco. I am wondering about them too. Seen some in the garden centre and they were £19 each. We had a lovely Victoria plum tree, and for some reason it died, so would love another plum tree.
I suppose its worth trying the Tesco ones .....if they don't grow perhaps we could complain and get a refund. Well, you would if you bought a toaster from there, and found it did not work wouldn't you!!!