Are there setup fees or other costs besides the Bavian subscription?

No. Bavian has no setup fee, no cancellation fee and no charge per team member. What you pay Bavian is:

• the Autopilot subscription: $150 a month, or $1,500 a year;
• $50 a month, or $500 a year, for each managed ad account after the three included.

Prices are in US dollars and exclude VAT, which is added on top at checkout. The analysis, the reports and the chat with Bavian cost nothing extra, and Bavian's CSS for Shopping ads is included in the Autopilot subscription at no extra cost.

Google bills your ad spend directly through your Google Ads account, and it never goes through Bavian. See What do I pay Bavian, and what do I pay Google?