Blink Camera Sets are on-sale on Amazon:
Blink XT 1 Camera Set - $80
Blink XT 2 Camera Set - $140
Blink XT 3 Camera Set - $200
Blink XT 4 Camera Set - $250
Blink XT 5 Camera Set - $300
Blink XT 1 Camera Set - $80
Blink XT 2 Camera Set - $140
Blink XT 3 Camera Set - $200
Blink XT 4 Camera Set - $250
Blink XT 5 Camera Set - $300