Musannaf Ibn Abi Shayba 19:33

Abu Bakr narrated to us, he said: Abd al-A’la and Abd al-Rahim ibn Sulayman narrated to us, from Muhammad ibn Ishaq, from Amr ibn Shu’ayb, from his father, from his grandfather, who said: He used to say, "The price of the shield is ten dirhams."