hmmm that is right up my street

for a real good flavoured one i think it pays to buy directly from a distillers....some really good Schnappses to try are
Abricotine and Williamine from the Valais Valley ( apricot and pear flavoured)
Damassine ( damsons flavoured from the Jura region)
Marc ( the swiss grappa) or Drusen/ french Lie....
Most of them you can get at Coop or Denner.....but try to source a distiller in your region...
Prost
Addendum: I did a quick general Google search ......"Schnapsbrennerei Interlaken", haven't found one in Interlaken itself but quite a lot of websites popped up,maybe worth a look at....if everything fails,,,,a tad further away is the Schnapsbrennerei Zürcher in Port,basically over the road from me and i can really recommend them! They also sell very small taster bottles so you could tast and sample before you decide to fork out more money for a bigger bottle of a Schnapps you really like.