Apparently the "Orthopulse" devices described in this article are made by OssaTec, so that probably is the main PEMF therapy option:
https://www.researchgate.net/publication/225146108_Pulsed_electromagnetic_fields_in_the_treatment_of_nonunionIt looks like you can't buy the Ossatec PEMF devices as a regular customer. Looks like you must be a doctor or specialist as it's a medical device.
I don't see any easy place to buy an Exogen either so if you wanted these I presume you'd have to ask your surgeon to order them for you and pay them back.
If anyone is undergoing LL now, could you show your doctor the article in the OP and ask them what they think? That is likely the best summary of all available evidence and it seems to be quite favorable.
From what I see, these devices don't have a major benefit for normal fractures but that is to be expected - normal fractures heal for everyone who is healthy in a few weeks. There is also high noncompliance because people don't worry about their broken wrist not healing.
But for distraction osteogenesis (limb lengthening) and nonunion where we are measuring progress in the scale of months and sometimes years, the evidence seems quite clear.
I think everyone should be using this (OssaTec + Exogen) or at least talking to their surgeon about it. For just a few thousand more you could cut your healing time by months and reduce your risk of nonunion considerably as well.