a buck's a buck

• a buck is a buck
• a buck is a buck is a buck
• a buck's a buck's a buck

a buck's a buck

1. (chiefly US) Every dollar of income counts toward one's financial well-being; money is a strong motivator, even in unpleasant situations.
   • 1977, Steve Cady, "Warm Weather Is Most Upsetting Factor To Platform Tennis Players at Forest Hills," New York Times (retrieved 2 Oct 2017):

     “When you play for money,” said Mrs. Prudence Reynolds of Short Hills. N.J., “the temperament changes. A trophy is a trophy, but a buck's a buck.”

   • 2000, Adam Berlin, Headlock, →ISBN, p. 110 (Google preview):

     It shouldn't matter whether a murderer tips you or a businessman. A buck's a buck. There's no morality attached to money.

   • 2011, Linda Turner, Christmas Lone-Star Style, →ISBN, ch 5. (Google preview):

     Anything that involves money is business to me. Granted, this is only pocket change to you, but a buck's a buck.

   • 2012, David Housewright, The Holland Taylor Mysteries: Penance, →ISBN, ch 2. (Google preview):

     And if many of the lawyers I work for are jerks, well, a buck's a buck.

• money doesn't grow on trees
• money talks