Where can I get a replacement cord?

You can try a variable ac-dc power adapter then set it to the rating. This is the information I could find in a manual on google.

I’m not sure if the dc connector from this one will fit, you will need to find out the size of the end connector.

https://www.amazon.com/OMNIHIL-Adapter-C...

“ To avoid fire or shock hazard, plug the AC Adapter into the humidifier then plug the humidifier direct to a 120 VAC or 240 VAC electrical outlet. “

Please reference the manual before executing anything. Remember V=IR, P=IV, https://www.sharperimage.com/si/pdf/manu...