Bundle Kit is completely free if you have less than 50 total orders (not bundle orders) per month.
As your store exceeds 50 total orders (not bundle orders) for a given subscription month, usage charges will be created according to our pricing plans.
For example, on the 51st order, a usage charge value of $7.99 USD will be created. On the 101st order, a usage charge value of $7 USD ($14.99 - $7.99 = $7) will be created, and so on.
The maximum total that you could be charged for any given subscription month is $139.99 USD (for 2001+ orders / month).