Hi Douglas, I managed to find these two 8.0-8.5 strands from same seller:
Aurora Hanadam 8.0-8.5 42cm strand with certificate. Price: 149,000 JPY, or around $1,394.54 USD
Grandpearl 8.0-8.5 42cm strand with certificate. Price: 598,000 JPY, or around $5,596.89 USD
Sorry no comparison...