* Photoshop (Standalone): $20.99/month (annual commitment) or $31.49/month (month-to-month).
* Adobe Creative Cloud Photography Plan: $9.99/month (annual commitment) or $11.99/month (month-to-month). This plan includes Photoshop and Lightroom.
* Adobe Creative Cloud All Apps Plan: $54.99/month (annual commitment) or $69.99/month (month-to-month). This plan includes all of Adobe's creative apps, including Photoshop.
There are also occasional discounts and promotions offered by Adobe.
Note: You can try Photoshop for free for 7 days.