For Switzerland I would recommend
Lebara Mobile, who charge $0.10 per international text and $ 0.09 per minute + $ 0.15 call setup-fee to the US.
They currently give away SIM cards if ordered online. In local stores SIMs should cost $10-20 with some initial credit, so the SIM practically costs somethine like $5. Lebara is sold e.g. in "mobilezone" stores.