Same confusion as Musken..
Are we talking about room rates, meal prices, transfer cost or activites price?
All Aman resorts have room rates and transfer cost up in the website, and I think Kage has compiled a very comprehensive list of rates of all Aman's base category room ^
The resorts or sales dept will email you price list of activities and menu when requested.

Side topic: Just asked Aman SP and Amanfayum about their excursion price list, found them to be significantly more expensive than the Indonesian ones. An onsite temple tour at Amanfayun costs around RMB 1000++ (around 150USD) and a guided tour of Summer Palace costs RMB 600++ (USD 100)....
These sites can be easily explored on one's own... just wondering if they are providing extra values like in Amansara/Amantaka where they help to avoid tourist crowds etc...