"It Depends."

Some coffee shop / cafès are experimenting with this in the US now. Some of them are making it on-site and other are sourcing it from various suppliers. Obviously making it on-site requires a great deal of upfront investment which many SMB owners cannot justify. The trade off is a plush 1500%+ markup on the finished product.
In my experience, those who outsource it and do their due diligence can estimate a 400%-700% markup.