Bestbuy offers Blink - Outdoor 4 XR — Wireless security camera with extended range, up to 400 feet. Sync Module XR included — 6 Cameras - Black for $164.99 (orig. $419.99) with free shipping.

Product Description:
Wireless security camera with extended range, go up to 400 feet from your home. Sync Module XR included — 6 camera system

• Blink Sync Module XR
  Blink Sync Module XR is the first system hub to extend the range of your Blink Outdoor 4 wire-free smart security cameras so you can easily see what’s happening around your entire property.
• Unlock even broader coverage
  Up to two Outdoor 4 cameras can now go even farther with Sync Module XR's extended range: up to 250 feet away from your home in XR mode and up to 400 feet in XR+ mode (video resolution may vary).
• Two-year battery life
  Set up Outdoor 4 in minutes and get up to two years of power with the included AA lithium batteries (with regular use).
• Enhanced motion detection
  Be alerted to motion faster from your smartphone with Outdoor 4’s dual-zone, enhanced motion detection.
• See and speak from the Blink app
  Experience 1080p HD live view, infrared night vision, and crisp two-way audio.
• Scale your Blink system
  Control up to 10 devices from the Blink app making it easy for you to arm, disarm, and use a group of your cameras together.
• Save and share clips
  Securely store your footage in the cloud with a free 30-day trial of a Blink Subscription Plan. You can also back it up locally with your Sync Module XR and a MicroSD card (up to 256 GB – sold separately).