Update: This very popular deal is still available.
Amazon has for Select Prime Members: Amazon Fire TV 4K Stick Streaming Media Player w/ Alexa Voice Remote for $49.99 – $25 w/ promotion code 4KFIRETV = $24.99. Shipping is free. Thanks SlickDealioNote, promotion code 4KFIRETV is for Select Prime Members and may not be available to everyone.