Newegg offers the Netgear Arlo Add-On HD Security Camera, model no. VMC3030-100NAS, for $159.99. Coupon code "EMCEKGJ35" drops it to $109.99. With free shipping, that's the lowest total price we could find by $49. It features magnetic mounting, night vision, live viewing, and wireless connection. Deal ends June 30.
Of note, it requires either the Arlo or Nighthawk R7000 camera kit.