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They are called Alpine Trekkers and they are made by Back Country Access. They sound like they would be a good fit for the OP. They are heavy, and they aren't cheap, but you may be able to find a used pair on TGR, or maybe egay.
Don't forget that you need a pair of skins, once again, since you are only going to be going three times, try to find a used pair in decent condition.