There is no shop in Switzerland known to me that stocks Scan-Speak drivers.
But there is someone who imports them, Mr. Cattaneo in Solothurn (I stated the address in your other thread).
The German Scan-Speak distributor might possibly deliver to Switzerland as well (Axel Oberhage Starnberg).
Here is a distributor in Netherland that carry drivers from several leading manufacturers like Vifa, Scan-Speak . I had great success in dealing with this company. Give them a try.