I don't actually know, one of my customers very kindly told me as I tried to flog her one of my £8.99 Miltonia Orchids (Is that the right name, doesn't sound very exotic!) I think they're doing bogof off something like that. Mine was in a nice square black bag so she had mine, bet tescos ones weren't nicely wrapped.
I'm just doing a vase arrangement for the bar next door and I've used five mahoosive aliums from Waitrose. £5.99 for five. Ridiculous. (Don't make a habit of buying their flowers to sell on but it is for a friend!