We have monthly subscriptions that renew automatically every month and annual subscriptions that renew automatically every year. Both of those you can cancel at any time.
You could certainly purchase a monthly subscription and use for only one or two months and cancel whenever you do not want your subscription to renew automatically. No penalty for cancelling.
Although, there is not any type of payments refunded for the time left on your subscription after you cancel. For example, if you cancel in the middle of your pay period, you will still have access until your renewal date and will not get any type of refund for the time left after you cancel.