WordNet (r) 3.0 (2006):

red cent
    n 1: something of little value; "his promise is not worth a
         damn"; "not worth one red cent"; "not worth shucks" [syn:
         damn, darn, hoot, red cent, shit, shucks,
         tinker's damn, tinker's dam]

Moby Thesaurus II by Grady Ward, 1.0:

105 Moby Thesaurus words for "red cent":
   C, C-note, G, G-note, a continental, a curse, a damn, a darn,
   a hoot, bagatelle, bauble, bean, bibelot, bit, brass farthing,
   buck, button, cartwheel, cent, century, copper, curio, dime,
   dollar, dollar bill, farce, farthing, feather, fifty cents, fig,
   fin, fish, five cents, five hundred dollars, five-dollar bill,
   five-hundred-dollar bill, five-spot, fiver, fleabite, folderol,
   four bits, fribble, frippery, frogskin, gaud, gewgaw, gimcrack,
   grand, hair, half G, half a C, half dollar, half grand, halfpenny,
   hill of beans, hundred-dollar bill, iron man, jest, joke, kickshaw,
   knickknack, knickknackery, mill, minikin, mockery, molehill,
   nickel, penny, peppercorn, picayune, pin, pinch of snuff, pinprick,
   quarter, rap, row of pins, rush, sawbuck, shit, silver dollar,
   skin, smacker, snap, sneeshing, sou, straw, ten cents, ten-spot,
   tenner, thousand dollars, thousand-dollar bill, toy, trifle,
   trinket, triviality, tuppence, twenty-dollar bill,
   twenty-five cents, two bits, two cents, two-dollar bill, two-spot,
   twopence, whim-wham, yard