I'm not sure if you have tried GIMP yet. It is a free alternative to Photoshop and has almost all of the same functionality.
GIMP (GNU Image Manipulation Program) is a freely distributed piece of software suitable for such tasks as photo retouching, image composition, and image authoring. It is a powerful piece of software with capabilities not found in any other free software product. It can be used as a simple paint program, an expert-quality photo-retouching program, an online batch-processing system, a mass production image renderer, or an image-format converter.
The advanced scripting interface allows everything from the simplest task to the most complex image-manipulation procedures.
The best part is it is 100% FREE