Hidepoo via Amazon offers its Hidepoo Spy Pen Hidden Camera for $31.80. Coupon code "S6NJPV92" cuts that price to $21. With free shipping, that's $11 off, and the lowest price we could find. It features a 1280x1080 camera resolution and up to 2 hours of recording time per charge. It includes a 16GB SD card and eight ink refills. Deal ends July 20.