Right now, Amazon is selling one such device, and better yet, at a discount. The $140 Famedio Heated Neck Pillow is currently on sale for only $27. That is 81% off the original price! Get it.

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Deep, moist and penetrating heat to promote blood circulation and alleviate menstrual cramps, joint stiffness, arthritis, muscle pain, inflammation, cold feet, and fight general fatigue.

The rotary action can be switched to two different directions of motion. Excitingly, this pillow also has a heat function to intensify the experience and help stretch out the muscles more effectively.

Arguably, there's no better feeling than turning your pillow over to the cold side in ... Right now, you can get your hands on the Justlet Queen-Sized Heated Mattress Pad for only $54.