The other day my godparents gave me a gift of a set of violin strings from the Red Label brand. The strings are made by the Super Sensitive Musical String Company.
It is strongly recommended to have extra instrument accessories with you as a musician. You never know when you will need extra strings, a shoulder rest, a music stand, rosin, tuner, metronome, or polish. Even just a plain cloth is helpful to get rid of any dust on your instrument, and if you play with a bow, having an extra one of those would not hurt either.
Any of these items can be lost, stolen, broken or simply wear out. I assume that you take good care of yourself. Why not take good care of your instrument?