Yes, unfortunatey Photoshop is very expensive. However, if you don't have photoshop, there is a free program out there that is very similar to it called GIMP-shop that you can use to create things of photoshop quality. It was the same program I used to familiarize myself with the PS interface before I was able to purchase photoshop and it can do almost anything that photoshop can (and a few things it can't). Granted, I would take my Photoshop anyday, but if you aren't able to afford it, this program can definately get you a good quality photo edit.
Here is the link to the site where you can download GIMP-shop or the original program called "the GIMP":
http://www.gimpshop.net/