As well as the Phillips Fidelio HP at $99, the SHP9500 is $55:
Philips SHP9500 HiFi Precision Stereo Over-Ear Headphones (Black)
https://www.amazon.com/dp/B00ENMK1DW/
These are very light, very comfortable open backs, and IMO a great buy for secondary use. I have a set paired with a small $25 bt receiver that I use with my Fire TV. Beats any MPOW or other bt headphones I've heard.
@solderdude 's take:
https://diyaudioheaven.wordpress.com/headphones/measurements/brands-philips/shp9500/
The SHP9500 is also relatively sensitive at 101db. They work great on my LG V20 3.5mm. When the LG is tricked first into 'high impedance' mode there really is no need for an additional amp..
Here is the $25 bt receiver I use with them:
CAMWAY Bluetooth 5.0 DAC, 192kHZ Digital to Analog Audio Converter with Bluetooth Receiver, Optical/Coaxial to RCA 3.5mm Audio Output with Volume Control for TV Phone Tablet Amplifer
https://www.amazon.com/dp/B07DJ9SRGY/
No, the receiver/amp above is likely not to ever get the 'hit it out of the park' panther, but for watching TV, it's fine.