WordNet (r) 3.0 (2006):

small change
    n 1: a trifling sum of money [syn: small change,
         chickenfeed, chump change]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "small change":
   bric-a-brac, chaff, change, chicken feed, chickenshit, details,
   froth, gimcrackery, knickknackery, minutiae, peanuts, petty cash,
   pin money, pocket money, rubbish, small beer, small potatoes,
   spending money, trash, trifles, trivia, triviality, trumpery