Recommendation for contact sensors, in bulk?

The Contact sensors are out of stock now. If anyone has any extras they want to get rid of, please let me know.

Are the IRIS 3210-L2 Smart Plugs good? I do not have any experience with them.
EDIT: I found [RELEASE] Iris SmartPlug Z-Wave Repeater with Diagnostics that convinced me to buy the 10 pack.