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Art supply stores sell good quality PD's for much less than $150. I think I paid $25 for mine. What's important is to understand how to use it. Mark has a video that deals with this. I recommend it.
Very interesting here’s a good painter doing really practical things with his painting and proportional dividers. No one has commented on his video.
Here' is a YouTube video that show the use of the proportional divider.I make my own from 8" to 3'.This is a pretty good video on getting the head proportions.https://youtu.be/HF2kE6Uc3yU