As an idea of costs, the tarp was delivered for about £17 and I used a £2 roll of gaffa tape in the construction. All the cordage was stuff I had lying around and though I took the poles with me on this occasion, in most Boreal forests, finding poles suitable for the supports would not be a significant problem or in many cases it could be built on lines strung between trees.
All in all, a cosy, secure shelter for around £20 can't be that bad and is easily repairable on site with a bit of gaffa tape on hand.
For trips abroad, where I often return with more than I left with, it's also not the end of the world if I do not fly home with it. There is always someone who can find a use for a spare builders tarp.