Thanks for reaching out to the Stock team. The different options for purchasing Adobe Stock are given below:
Individuals and teams can access Adobe Stock standard assets (standard images, standard templates, and standard 3D assets) through subscription plans. Subscription plans range from three standard assets per month to 750 standard assets per month. Premium assets, such as videos, Premium collections images, and editorial images or videos, can be licensed on-demand or using credits from a credit pack. You don’t require a subscription plan to license on-demand assets.
Learn more about Adobe Stock pricing and membership plan | Adobe Stock
If you sign up for a subscription plan( 10 images or 40 images per month one-year) plan, the first month is a free trial, Adobe doesn't charge you for the 1st month; the subscription billing actually starts from the second month.
If you cancel during the first-month billing cycle, your credit card will not be charged and your service will continue until the end of that first month’s billing cycle. If you cancel within 14 days after the beginning of the second month’s billing cycle, you’ll be fully refunded. If you cancel the service after the 14th day after the beginning of the second month’s billing cycle, you’ll be charged 50% of your remaining contract obligation and your service will continue until the end of that month’s billing period.
For more information, please refer to Legal subscription terms | Adobe
Hope this information helps!
Feel free to update this thread in case of any additional questions.