Amr bin Shu'ayb (may Allah have mercy on him) said: When wealth became abundant and camels became scarce, Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) fixed the diyah upon the town-dwellers, in place of 100 camels, at between 600 and 800 dinars.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16167