Prices for the options vary depending on the options selected and its contract periods(6,12 and 24 months).
Monthly fee for an option multiplied by your contract periods will be your total amount of due.
See more detail for option prices here.
You can choose the minimum period of option use from 6, 12 and 24 months. You can set its minimum period of use when you are on process to register an option on My Z.com (Z.com control panel).
Note: the options will be cancelled as well if your WordPress server is cancelled.