Hi! I have my eye on the same bag
The private sale will happen this month (also online and the link is usually shared here) however, I would be surprised if the black with gold is included in the sale - last year's sale had the Lou Lou's in black patent with silver hw and a few lighter colors with silver hw. The outlets ship but rarely ever have gold hardware items. If it is not in the private sale, your best bet is to purchase when Saks or another retailer has promotions for X$'s off a purchase of X as YSL is often included in these promos. (Someone else may have better tips - just my personal experience).