This Bible contradiction is from the Infidels.org.
Matthew 27:9 View context
Then was fulfilled that which was spoken by Jeremy the prophet, saying, And they took the thirty pieces of silver, the price of him that was valued, whom they of the children of Israel did value;
Zechariah 11:12 View context
And I said unto them, If ye think good, give [me] my price; and if not, forbear. So they weighed for my price thirty [pieces] of silver.