I'm not sure it would work out at 30p per portion growstuff. Possibly not.
We have started going to a market in our local town at the weekend. Everything is £1 usually. A large bag of potatoes (potatoes with earth still on them). They are great. We get two large punnets of fruit for £1 - strawberries, blueberries, raspberries etc. Lots of veg and 3 cucumbers for £1. People could split them up with family or friends and share the cost. We were dubious at first as to how long it would keep for but it lasts well over a week. I realise not everyone has such a place and if course ideally you need transport, although I have been in on the bus.
Another silly little ABC game - shops we have loved and lost?
What is a reasonable minimum spend for an online grocery delivery??