If I were you I would collect them in a tin (or some container which doesn't take up big space), and the first time I go to some waste collector to get rid of something special (even if that might be in 3 years from now), I would just take them too. Might be less of an effort than making individual trips to get rid of a few blades.
In e.g. China, L-cysteine is produced from human hair (among other things) and used as a dough conditioner (bread 'improver')
Or Google for l-cystine bread improver human hair