I want to buy sandbox for my developer. We are going to have training on salesforce commerce cloud developing. Could you please help to show me how to contact and where to buy these sandboxes. Thanks and look forward to hearing from you soon. Yours sincerely, Tuyet Tran
I assume you already have a production org and one or more sandboxes that have been allocated for other purposes.
Contact your Account Executive to add an additional Sandbox license. As per How is a Salesforce Sandbox licensed? there isn't a public pricing structure that applies to everyone. It will depend on your production org edition and additional features, such as Commerce Cloud.