Since I have no information on how the chips are declared and therefore do not know what additional costs (VAT, customs, handling, etc.) to expect, I'll ship first and ask for payment later.

For reference, prices for sending parcels through SwissPost are listed here (rate: 1CHF ~ 1.07USD). I'll try to lower those costs by sending from EU, otherwise the prices listed there for Urgent parcels (handled through TNT global) are the worst case shipping costs to expect.