I think electropglyph nailed it. Better if you personally know the person or know what they can do arrange exchanges of various things. I might even do an exchange myself soon I still suck at buildings.  But still you need patience. I had to wait two months after compleatign some work to be paid but I did get paid.

The wit of a misplaced ex-patriot.
I cheated on my metaphysics exam by looking into the soul of the person next to me.