If you allow your import car in Switzerland, you will usually be assigned a control plate number at random. However, you can also bid for a number via the auction platform of the Road Traffic Office. There are no upper limits to the costs of the auction. For this reason, the control plate number SG 1 (Canton St.Gallen) was auctioned for CHF 135,000. Try your luck. You can find the platform on the homepage of the Road Traffic Office.