I have written something of my experiences of the cost of no dig in the Cost of No Dig thread, which might be of interest.
It costs me about £30 a year in mulching compost for my back and front garden and my allotment which I think is half a standard size (although here it is called a full sized allotment). The back garden is around 30 x 100 ft and includes a 12×40 ft polytunnel, the front garden’s growing area is mainly three raised beds of 4 ft x 8 ft)
I also have home made compost.
My allotment is very easy to maintain, DigWinstanley even though I don’t have much time!
Until a month ago I was not only helping Charles with the picking in his garden and the courses but also running a large no dig kitchen garden on a private estate single handedly – even though my working days often started at 5 am it was still possible to keep my allotment, beds and polytunnel full of abundant veg because it is so simple and effective.
The only bits of my garden that did not fare well thanks to my very long work and domestic commitments were existing borders which were not set up no dig, where perennial and annual weeds had a bit of a party. That is a job for this winter!