I am charging 2.5x face value if is a small quantity, shipping depending on amount but normally from my home is about $1.50.
If is for larger sales then I will drop price depending on how many of what is wanted. The % over $2.5 would drop and more so the higher the value of the chip; that way you do not get punished for buying larger. The value of each chip would be very similarregardless of the face value.All depending on the amount.
Thanks,

Luis