Just a heads up. If you want a similar PIR sensor for cheaper, and it comes with a bonus case with 2AA holder and plenty of space ;P
Radioshack sku 630-0282
Clearance item/Close Out price. The bigger Radioshacks have them, but have them search the sku in the district tool if not (the online one, not the POS one). Talking Pumpkin Insert. 97 cents.
Same BISS0001 PIR controller, comparable PIR sensor (I opened one and checked).
All smd caps/resistors, so it lies flat if you want to take it out of the case.
Picked up three. At 1.03 each, I couldn't resist. Two will be left