How much does a gold ingot cost?

What size? I've seen ingots as small as 5 gm and as large as several kilos. Right now I could get a 1 oz bar for $1,630.40, 100 gm for $5,238.25, 5 oz for $8,127.00, 10 oz for $16,204.00, 1 kg for $51,807.71, 100 oz for $160,390.00, or 400 oz for $638,360.00.