HDE via Amazon offers Prime members the HDE Pinhole Mini Wireless Camera with Receiver Set, model no. HDE-H74, for $21.99 with free shipping. (Non-members can spend $25 or more to bag free shipping; otherwise, it adds $5.70.) That's the lowest total price we could find by $2. Features include 380 lines of TV resolution and a wireless range of up to 200 feet.