The supplier in Switzerland is:
 
Company Item Code Price (CHF)
Pluess-Staufer AG
CH-4665 Oftringen		 DOW CORNING SYLGARD 184 + CATALYST
Kit 1.10 kg (RTV+CAT)		 10133602  1320,- 

The data sheet for Dow Corning Sylgard 184 is available here as  PDF-File . For more information contact Dow Corning:
 Dow Corning Corporation

B. Krause, February, 14th 1997
H.P. Wirtz , last update: 4-May-1999