$50
Bought from Amazon for $90. Used for only 1 month, selling because I am moving and buying a different sized bed. Works really well with 10 different heat levels and a timer, heats up instantly with no cold spots.
Machine washable.
https://www.amazon.com/Bedsure-Waterproof-Heated-Mattress-Full/dp/B0D5QNZY9P/ref=ast_sto_dp_puis
Please do not message this poster about other commercial services.