This one from Amazon is my fave! Option for 2 hour shut off or stay on. Heats up very quickly. Gets very hot but I haven’t burned myself on it which is good. Big enough to wrap around my front pelvis/belly.
I use inexpensive Sunbeam heating pads like this one - https://smile.amazon.com/Sunbeam-King-Size-MicroPlush-XPressHeat-Controller/dp/B00JA9D914/ref=sr_1_2_sspa I've had one at my desk for like 3 years now and it's still held up despite me constantly getting the cord wrapped up or run over. It gets pretty hot too! But it does also have a 2 hour shut-off, which is good in case you fall asleep or forget to turn it off when you're done.
https://www.amazon.com/dp/B00JA9D914/ref=cm_sw_r_cp_apa_glt_fabc_KG2JTSKJET601Y8ENTTM
My girlfriend has one of these for obvious reasons. Works like a charm. Doesn't get cold after 5 minutes either!
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https://smile.amazon.com/Sunbeam-King-Size-MicroPlush-XPressHeat-Controller/dp/B00JA9D914/ref=sr_1_7?crid=Q7H3PQ7YWJB&dchild=1&keywords=sunbeam+heating+pad&qid=1603121005&sprefix=Sunbeam+hea%2Caps%2C181&sr=8-7
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