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Monoprice [monoprice.com] has their Z-wave plus motion sensors on sale for $ 22.99 down from $ 29.99 and with coupon code "CRYPT" you get an additional 20% off making the final price $ 18.39 with free shipping.

http://www.monoprice.com/Product?p_id=15271

This is the lowest I’ve seen the Plus line of motion sensors on sale for.