Book listing and repricing tool

I am starting to sell used books through Amazin FBA and am wondering if anybody knows of an affordable app that both lists and does auto repricing. I am just getting started and am already a $80 a month between ScoutIQ and FBA and only have 100 books. I need the tools, as I akso have an ebay business. but hesitate to put a lot more into early overhead. Any suggestions are appreciated