sitnica

1. trifle; small matter
   Nemojte da se svađate oko sitnica. — Don't argue over trifles.
   Hvala na pomoći! — Ma, sitnica. — Thanks for the help! — Oh, it's nothing.
2. (of an object) little thing; small gift
   Kupila sam mu neku sitnicu za rođendan. — I bought him a little something for his birthday.
3. detail
   Ona pazi na svaku sitnicu. — She pays attention to every detail.
4. colloq. (of money) next to nothing; small sum; very low price
   Kupio sam to za sitnicu. — I bought it for next to nothing.
   Popravka košta sitnicu. — The repair costs next to nothing.

Don't confuse it with sitnina, which means small change (coins).