One more note.

As I said, I would spend as much as $2.30 for postage and insurance, However,

When I sell an expensive chip, I feel I have made enough on that chip to pay for the postage and if need be, insurance and still come out way ahead. Ergo, I do not charge for shipping and/or handling for costly chips.

I will admit, however, that when I sell a chip for face value, I will sometimes ask for $1.00 postage and sometimes just the $0.49¢. Lately, it was just the $0.49¢. I use to think it was easier for the buyer to add $1.00 but I see that doesn't make any sense and I certainly am not going to get rich with that extra $0.51¢