If the going rate ends up lower than what you paid for them, especially by a large margin, you will have to settle for selling at the going rate and simply tank the loss, in most cases. Example:
You order 1 Kreis Cygnus for $35(with shipping included), because you ordered it early or somesuch.
Going rate ends up $25(with shipping included).
You will have to sell either at $25 shipped, or within a dollar or two of it, to conceivably make any money at all. You will technically still be tanking a $10 loss, but if you try selling at a higher price than the going rate, you will make
no money instead.