In the UK, Photoshop CS5 sells at something over £600 for the non-extended version. Lightroom for above £200. If you want to get them a whole lot cheaper you can easily qualify for a legitimate education licence by enrolling on a local authority-run adult education evening class course and then getting the tutor or the centre to let you have a letterhead confirming your educational status. You’ll then get CS5 for about £160 and LR for about £60.
The course will cost you about £50 (less if you are retired) so you are way ahead even before anything photographic or social you might get out of the course! I encourage all my students to take advantage of this at least with Lightroom.