For external guests, the cost is $ 85, inclusive of the tasting. (fb101.com)
This is the reason that the updated app has an option to enable organisers to add external guests in their Hangouts video calls by sending them a unique meeting link. (techone3.in)
Yes there is the option to add external guests to Office 365 group, but in most cases this is not the scenario my customers are looking for. (techcommunity.microsoft.com)