MaxKare Large Electric Heated Blanket sells on Amazon. I think the price is very good.  Please read some of the reviews and see what people thought of the product. Do check how you might qualify for a free shipping offer if available.

  • Full-body Use】Deluxe and soft flannel is skin-friendly and helps preserve heat for added comfort; Features large size (62*84in) to embrace the whole body.
  • 【One-Button Operation】Easily control the power and choose among 4 heating levels simply via a button (range: 90-107℉) for desired warmth within 5 minutes; Equipped with 10-hour auto-off feature to leave you peace of mind.
  • 【Machine Washable】The heated throw machine is washable in water below 86℉ benefiting from the detachable controller and power cord, maintaining hygiene and softness for long; Please never dry in a tumble dryer.
  • 【Assured Safety】Quality and safety of the heated blanket is certified by ETL certification; The heating wires are uniquely placed for more uniform heat distribution with overheat protection system to enhance safer user experience.
  • 👍 Worry-Free After-Sales Service: Undamaged electric throw blanket with packaging can be replaced with a new one. A satisfying solution will be provided in 24 hours for any problem.

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