i'm trying to buy one subscription and it's defaulting to 8

[Vivienne Errington-Barnes]

Is this the minimum number of subscriptions you need to buy?

[Gaurav Kataria]

Vivienne, it could be that you have 8 people in your workspace. Trello charges for all members and multi-board guests that are in your workspace. See this article for more details: https://support.atlassian.com/trello/docs/how-billing-works-with-trello-premium-and-standard/

[Nikola Perisic]

Welcome to the community @Vivienne Errington-Barnes 

I believe that you are refering to the plans that Jira is offering: https://www.atlassian.com/software/jira/pricing

[Nikola Perisic]

Sorry,my bad I meant:https://trello.com/pricing

There is no default number of subscriptions needed by the way.