Hi Michael,
Sorry to hear that you are facing troubles with Stock services.
I understand your concern and agree that there are certain situations wherein you would just need a single image and not the complete plan.
We've discontinued the single image purchase option for all the users. The smallest subscription plan which you can purchase is the 3 standard assets a month which can be cancelled at any time and does include an annual commitment.
I understand your requirements for the Stock images and since there is no such plan available as per your requirements, I would suggest you to check out credit packs offer.
Currently, the most flexible option is to buy a pack of 5 credits, which can be used to license 5 standard images any time over the next 12 months.
You can check the pricing for credit packs here: Adobe Stock pricing and membership plan | Adobe Stock
Please see Credit packs for Adobe Stock for more details.
Feel free to update this thread in case of any additional questions.
Regards
Twarita