Woot offers Blink Video Doorbell Used Good | Two-way audio, HD video, motion and chime app alerts and Alexa enabled — wired or wire-free (Black) for $24.99. Free shipping for Prime Members.

Product Description:
Answer your door no matter where you are from your smartphone with 1080p HD day and infrared night video and two-way audio.

• Experience long-lasting battery life, custom alerts, privacy settings, and more.
• Get alerts when motion is detected or someone presses Video Doorbell. Connect to existing doorbell wiring or pair with a Sync Module (sold separately) to engage live view and two-way audio on demand.
• Designed for every home, go wire-free or connect to doorbell wiring to also sound your existing in-home chime. Without wiring, you can use your Blink Mini camera (sold separately) as an indoor plug-in chime.
• Set up yourself in minutes with the two included AA lithium batteries then connect to wifi in the app.
• Works with Alexa — receive alerts and answer with two-way audio. When wired or paired with a Sync Module, just ask Alexa to answer the front door.