AVANTEK D-3B Wireless Doorbell Kit $20 at Amazon $20 $30 Amazon with AVANTEK US has the AVANTEK D-3B Wireless Doorbell Kit w/ 2 Plug-In Receivers & 52 Melodies for $20 with free shipping on $35+ or with Prime. $20 retail: $30 Posted by Faraday05/28/2026 at 11:31 AM PT