Amazon re-pricing inventory system

I need an Amazon re-pricing system for my book inventory. I need to be able to reprice up to 50 books. I do sell the same book under more than one condition so I need repricing that will change the prices of up to 50 out of an inventory of 800 books. I don't know a lot about how these things work so it needs to be simple and easy to use. I have no idea what skills are needed for this project so I entered something above in the skill set to activate the posting. I just need it to work. I would like this within a week if at all possible. Thanks