I'll second that advice--I can't believe there are still so many Iris v2 motion sensors floating around, especially at this price. 
But if you insist on something new, my two recommendations would be either the Sylvana/Osram Lightify motion sensor (looks like a slightly uglier Iris v2 and is/was made by the same beloved OEM) or the latest (2018/v5) SmartThings motion sensor. Both are around $25 USD, which isn't bad--the Iris ones were usually around $30 new, and at the time I thought that was pretty good (that's why I bought my first one).
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