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Re:Ask HN: Where do you post your product management jobs? by jamey-aha on Tuesday June 13, 2017 @11:32AM (#14545532)
There is a free monthly job thread on Roadmap.com, a community of product managers -- https://www.roadmap.com/hiring-product-managers-june-2017

LinkedIn is also a good resource, but it costs a few hundred dollars for a monthly post.