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Amazon [amazon.com] has Blink Battery Doorbell 2K+ Sync Module Core included – Wireless video doorbell, 2K resolution, enhanced audio – Black (Backordered) or White – for $35.99 + Free Shipping

Best Buy [bestbuy.com] also has Blink Battery Doorbell 2K+ Sync Module Core included – Wireless video doorbell, 2K resolution, enhanced audio – Black or White – for $35.99 + Free Shipping