Academic Superstore has great deals on software and some hardware. They have a catalogue and a website. Students and Teachers get discounts but, you will need to provide proof of status. The amount of proof required is dependent on the software you purchase. The site is:

academicsuperstore.com

Hypersnap is the program that I used last year for screen captures it did a great job! One down side is that if you are using a demo copy you get their logo on the picture but the sofware is only 35.00 http://www.hyperionics.com/