Hello Talia
I acknowledge your commitment!
As you say that is a lot of compost. As Tris says above, there are cheaper ways to buy it.
And also as he says, why such a big area?
My dig/no dig beds, including two paths are 20sqm, both beds, and last year they produced 200kg veg.
Four such beds would be sufficient for many families.
So are you proposing a market garden?
Screen shot below: if it does not work, scroll down to see the table here
http://www.charlesdowding.co.uk/no-dig-growing/homeacres/
[caption id="attachment_37810" align="aligncenter" width="638"]
Total harvests 2017 from 20 sq. m of beds[/caption]
