The Agency plan is $129 a month, or $99 a month when you pay yearly ($1,188 a year): unlimited new emails (fair use), shared with your team. You can buy it on the pricing page.
Or write to support@klavigma.com. Tell us who you are, how many people would use Klavigma, roughly how many emails you send to Klaviyo a month, and the Google emails your team signs in with. We answer within a few working days.
Just you, a few emails a month? Free or Starter is probably all you need.