Search sites for Switzerland:
In English:
http://en.toppreise.ch/

http://www.comparis.ch/comparis/default.aspx

In German:
http://www.preisvergleich.ch/

http://www.preissuchmaschine.ch/


Maybe also important to look at test reviews before you buy:
http://www.testeo.ch/ (in German)
http://www.testeo.co.uk/ (but models might not been the same as you buy in Switzerland)