Amr bin Shu'ayb (may Allah have mercy on him) narrated from his father, from his grandfather (may Allah be pleased with him), that in the time of the Prophet (peace and blessings be upon him) the price of a shield was equal to ten dirhams.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السرقة / 17177