I can't vouch for these but they were suggested by readers posting at "The Register" as possible alternative choices.

 

Serif Draw Plus 06

http://www.serif.com/

 

Xara and Xara Pro

http://www.xara.com/us/products/designer/

 

I know it's a shock to the system. I've been looking around for some way to still buy a boxed CS 5 or CS 6 Photoshop and no luck. This has really impacted individual users. I hope everyone finds suitable alternatives that fit their needs.  Best of luck to everyone.  m(_ _)m

My brain is just a toy box filled with weird things