Introduktion
I can find collimators for lasers that are cheap, for instance odicforce, or Banggood.
conrad har också, men bara som lins, inget hölje eller fäste (search for Kollimatorlins).
Lightpath offers collimators threaded to fit the standard optical cables.
Aliexpress has collimators that fits on the sma905 connector.
Alibaba have lots of different led colimators.