Coffee heating pad. $11
I’d probably get a different one next time, something that makes it hotter bc I like really hot, but def does the job. So much better than microwaving and leaving it on there all day
Mr. Coffee Mug Warmer https://www.amazon.com/dp/B000CO89T8/ref=cm_sw_r_cp_apip_Lk1Rh5ejAPhmi
I use this one. $10, plugs into a wall.
I got something similar to this mug warmer and I love it because I can use whatever coffee mug I want to, I can switch it up to use a small glass dish with some wax fragrances to melt, I can put a candle that the wick is too low. But my favorite part is when I’m getting closer to finishing my tea or coffee, it makes my drink is at its hottest because it’s the least amount of fluid, so its just gets warmer as I drink it.
This is a much more trivial one, but man, have I enjoyed life that much more since I got one of those electric cup warmer things. I've gone through 2-3 over the years, currently using this one. I'm not big on these SkyMall-type unnecessary accessories, but I'm the sort of person that can sip on a coffee for an hour or two, and it's really, really nice to have it stay warm (not HOT, but pretty warm!) indefinitely. They only cost 10-15 bucks, and they last for years.
Coffee warmer. This is less funny and more useful. Keep coffee hot at your desk all the time!