Some brokers recently have been telling buyers (me included) that sellers are typically taking $5-8 off their listing price. This doesn't make any sense as not all contracts are the same size or same price. Some contracts are way over priced to begin with. In other words, there is no one size fits all offer. Each resort has a value based on UY, number of points, current and banked points, popularity and availability. Study the ROFR thread and stalk resale brokers sites. Do your homework.
There are currently many SSR contracts available in the $90's. I would offer what you feel is fair and if the seller declines move on to the next best contract until you get one. Good luck!