Not sure how long it lasts, but there is a 15% off of everything sale at Thermoworks right now.

https://www.thermoworks.com/?tw=PelletFan

Just got me an MK4 for $69. 30% off.  Been waiting for a sale on these.

10% off now, but it's bogus.
Have to enter your email address to get it.
I did and it told me I had previously subscribed to their list.
Apparently you can only get a discount once.