Hello,
I think CHF 100.- is too high, even though you asked in Bern.
I myself is a nail tech in Lucerne and around here most of the salons offers "Maniküre" between CHF 35.- and 50.- depending on the services.
If it's more than CHF 100.- nail techs you met might have misunderstood with nail enhancement with gel or powder & liquid, which is more common than manicure here.
As I am away from Bern, I don't know any nail techs in Bern personally.
But from the HP of professional organization, I found a well-qualified nail tech in Kanton Bern.
http://www.nailboxbelp.ch/index.html
Her service of SPA manicure costs 60.-, it's a bit expensive. :-(
http://www.atelier-lilo.ch/preisliste.html
This one is much cheaper, trainee prises are much lower, but I don't know their skills and qualification.
Did you already try
www.search.ch with words such as "Maniküre" "Nagelbehandlung" "Nagellack"?
I hope you can find a good salon soon!
Nagel007