Personally I've seen sales for a new pump at $115 plus shipping. The brass costs a bit more, but not enough for me to justify it personally. I don't think I would pay more than $100 for a used pump unless there was something significant to make it worthwhile.
I'm not threadcrapping, that's just my line of thinking on why I passed on this one compared to the others that have been up for grabs the last couple weeks. However, those deals are few and far between, so if I wanted/needed a pump right now, or in the next 2 months, I would jump on this in a heartbeat because it's still a good deal, I just have the luxury of being able to wait a little longer... it'll take at least that long to convince my wife this is a good idea