Board Thread:Game Discussion/@comment-28169398-20180116061144/@comment-26829117-20180116134457

Likely upgrade costs for Exclusive Series:
 * Ford GT (2017) - 80 on top of Burning Rubber (Series) costs
 * Aston Martin One-77 - 400 on top of Collector's Championship costs

So in summary:
 * LTS gold costs about 560 (if you are stupid) or more likely 700+ (if you aren't stupid)
 * ES gold costs about 480 assuming cars picked are correct