We live on a slaty shale ridge, so soil cover is minimal to nonexistent. We are in the process of installing our first hugelkultur, which should be about 5' x 5' x 60' by the time we're done. We've decided to go ahead and buy some soil. A 5 x 8 trailer load cost $30, and it was quickly absorbed by the first layer of wood. When we went back to get a load of
compost for our sheet mulching projects($40), we ordered a truckload of soil (around $250 for rich dark humusy stuff). I have a feeling it will be gone in no time with all the projects we have planned.
Of course, we are also sourcing downed trees, branches, rotting hay, manure, leaves and whatever else we can get our hands on from friends and neighbors, but soil does not come free hereabouts (unless it is subsoil, which isn't very helpful in promoting the decay of logs).
As my husband points out, these are one-time inputs which will keep on feeding us and our friends for years and years. And that truckload of soil costs about the same as a couple weeks of groceries.