Amazon has the Firestick 4k media player for $25, if you apply coupon code: 4KFIRETV This may be account specific, but it showed up on the item page for me today.
https://www.amazon.com/gp/product/B079QHML21
My order:
Order Summary
Items: $49.99
Shipping & handling: $0.00
Fire TV Stick 4K: -$25.00
Total before tax: $24.99
Estimated tax to be collected: $2.06
Order total: $27.05
Qualifying offers:
Fire TV Stick 4K