Ed–
Renting is off the best solution when you’re looking for something on par with the Panasonic monitor. But for something you can have on hand for yourself, there are options available. Most notably: Ikan, Marshall, and Nebtek. They all increase in price point and features respectively. Also, if you really want to go “rebel” there are some DIY solutions out there. Ultimately a field monitor, in my opinion, is a must–if nothing else for focus in HD–and renting isn’t always an option when I want to grab my rig and go. For some scenarios, Adobe OnLocation is a great solution if you have the laptop to run it properly.
https://www.ikancorp.com/
https://www.lcdracks.com/
https://www.nebtek.com/