Here is the link that you can refer to get to know about Creative Cloud Plans :
If you want to know about the Adobe stock subscription plans, you can refer this link :
Adobe has recently been offering discounts, presumably because Adobe Stock is too expensive
Look carefully at terms of usage and copyright to ensue you can fully use the images in your own projects.
Also search other on-line image libraries. Adobe Stock is simply the new name for Fotolia, following its acquisition. Subscribers to Creative Cloud are not yet feeling the integration, at least on pricing.
I don’t work for Adobe so this is an outsider’s view rather than a staff view.