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I am trying to find an inexpensive but highly effective br___t pump. I have borrowed the Medela pump in style in the past from a friend and it worked fine. I hardly used it though. I primarily used it in the begining to help with engorgement and later when I might go out for an evening without the baby and need to express some milk for relief since I make an AMPLE supply of milk. I have heard a lot of great things about the Avent Isis manual pump but I have carpel tunnel in both hands. Can anyone advise who uses the Avent Isis if this will work for me? How tiring is it on the hands and for how many minutes do you usually pump? I don't want to spend hundreds of dollars on the Medela when I expect I won't be using it very often and my friend is currently using hers. Are there any other pumps on the market that would work better than the Avent but about the same price? Thanks for your help!