How much does it cost to make duplicate keys? I have a post office box key that I need as my daughter lost one,so now we only have one key yet need two.

Whatever the cost, they are sure to be as low if not lower than anyone else. They are magicians over there!

$2-$3 per key. But keys to PO Boxes in Post Offices can't be copied. Only PO can provide them.

Not sure because the price of keys for different uses varies. A car key may be more than a house key. I would suggest giving them a text or call