I do but I'm in England and I don't know if you can get the same ones where you are. The battery pack you can, not sure about the blanket, but at least you will know what to look for.

https://www.amazon.com/Portable-RAVPower-20100mAh-External-Nintendo/dp/B0823LWZGH

https://www.amazon.co.uk/Silentnight-Comfort-Control-Electric-Blanket/dp/B00B0KJ3F2

This is what I use but I can't find it on Amazon.com (I am assuming you are in the US). But I'm sure you have a similar thing. I think you call them 'heated mattress pads', like this one.

https://www.amazon.com/Giantex-Low-Voltage-Temperature-Detachable-Connector/dp/B07DJ1YHFS