Amazon Echo Input: $10
Amazon has Amazon Echo Input on sale for $9.99. Shipping is free with Prime or on orders $25+.
Note: Echo Input adds Alexa to your favorite speaker and connects via 3.5 mm audio cable or Bluetooth. Just ask Alexa to play a song, check the news or weather, set alarms and timers, add items to your to-do list, or control compatible smart home devices.