To the best of my knowledge (which might be incomplete), pretty much all instances of tithing in the Bible involve agricultural produce or animals. Even in the time of Jesus, when money was commonplace in the Roman Empire, the Pharisees would tithe "mint, dill and cumin", as indicated by Matthew 23:23 (NIV):
"Woe to you, teachers of the law and Pharisees, you hypocrites! You give a tenth of your spices--mint, dill and cumin. But you have neglected the more important matters of the law--justice, mercy and faithfulness. You should have practiced the latter, without neglecting the former.
What is the biblical basis for tithing money instead of agricultural produce or animals?