100 bucks is about right for new at the hardware store but not used at the scrap yard. As I'm sure everyone knows scrap yard prices are all over the board.
Our cheapest scrapyard locally (35 mile drive one-way) for a 3.5" is $85 for a 9' pole. I prefer poles with experience, and I've never had an issue "popping" one as our soil is sandy loam for miles around. If you think that's "too much work", then what do you call setting up a dish in the first place?