www.skitouren.ch has a section for courses (skiing dominant at this time of year but will change in the spring) as will the sac no doubt.

Or go and have a chat with Christoph in Eiselin sports (tram 14 toward oerlikon) but only about 4 stops from HB. He's the only young-ish bloke in the shop and is an aspirant guide or maybe qualified now. very helpful and speaks good english.