First of all, this stone only scores a 4.4 "good" on the HCA. Normally scores of two or less are considered optimal, although this does not necessarily eliminate your stone. You may like the way that it looks and may not be willing to pay more for a better cut.
Six vendors are offering this stone through PriceScope for between $8657 and $9063. You are welcome to offer lower, but this stone is already competively priced because of the competition (that was redundant, but you know what I mean).
Comparable stones: 1.50 G SI1 (I know it only has fair symmetry, but look at the ideal scope image. It also scores a 2.3 on the HCA.