AITSL website has been recently updated with the new fees for the skills assessment and related services. New fees are as below:
Application for skills assessment AUD $845
Appeal of assessment outcome AUD $845
Skilled Employment Statement (SES) AUD $228
Additional copy of assessment outcome* AUD $97
* A fee only applies when an additional copy is requested of a certificate with a reference number starting with WAMS.
Source: https://www.aitsl.edu.au/migrate-to-australia/fees