Or price them and let the buyers pick their preferred shipping option with a disclaimer about losses with cheap methods. Like that, you are covered and even if the buyer pick a better and faster method, you aren't losing money. I think you have shown too much heart and there is surely some guys who are attempting to get a freebie (like a sli setup where they order one, claim it's lost after 1 month and get a 2nd one free).

With delivery confirmation, you are covered.