What happens if the price of my plan changes?
The price you pay for an AirBop plan remains constant while you are subscribed to it. If the price of a plan ever increases, you will continue to pay the same price that you signed up for, for as long as you remain subscribed to that plan.
This is only true for any plan you are currently subscribed to. If you change to a different plan, you will pay the new current price for that plan -- not the price that existed when you first signed up. However, the price of that plan will remain constant for you, until you cancel the plan or change to a new one.
In other words, your price for a plan is "grandfathered in" for as long as you are on that plan.