<"zack" (sp?) is one that comes to mind, but I don't know which one it is.>

Zack was sixpence, Marty, and a razoo was [according to Syd Baker] a non-existent coin, sometimes a brass razoo, as in "I haven't a razoo" (I haven't any money). There was also a skerrick (a small sum of money), but used negatively as in "I haven't a skerrick".