I've found a great alternative to tescos' where obtaining nice flowers is concerned.
Just next to our friendly neighbourhood toilets. I've walked past it just about every school lunchtime for the past two years, and hadn't noticed it until about a month ago. The main reaction was, 'WHOA, when did that get there?'... people roll their eyes. There's another one on the other side of the car park entrance way (*loud whisper*; THIS IS A CAR PARK ENTRANCE WAY).
Some stuff I've found there.
I nabbed a couple for a) Beth and b) on my way back, the dining room table. I'm sure it appreciated the gesture.