You are not going to find heated IMU for any cheap price whatsoever especially in the current chip shortage. I recently purchased a skynode from auterion and they added a 25% fee to the total order due to chip shortage!!! I have had great luck with the mro pixracer and may of the matek boards. Maybe you could snag a cube black for cheaper used but there is not comparable with heated IMU in the price range you are looking for.
It looks like the “industry” one has higher-quality IMUs…as an example the IIM42652 is rated for -40-105 degrees, while the ICM42688P is rated for 0-70. Not sure what’s going on with the “industry application edition” to make it so much more expensive.
To the OP: I realize it’s not quite what you asked for, but if you can live with just redundant IMUs and not the heat or the built-in vibration isolation, Matek’s H743-wing might be an option. You might want to do the IMU temperature calibration though.
I just purchased one from Tim. He is great glad someone within North America is a reseller. Highly suggest using https://smartfleet.systems/. He is quick to respond!
I will note that while I personally love the cables that come with it (they are developer oriented with individual Dupont leads) if you didn’t have lots of JST GH cables (CAN, I2C, etc) from other kits you will likely need to make some.
Perhaps they just sent those to me though?
Disclosure: Jason at Qiotek sent me the controller for free with my purchase of 2 F9P GPSs. (should have said that earlier)