This training from Joel Schwartz looks very good:
It's moderately priced at $250 for 6 CEUs, with group discounts available. I am in a professional networking group with Joel and have experienced him as quite impressive. I feel like he has a good balance of affirming ADHD and autism as valid neurotypes that don't need "curing," while also recognizing that neurodivergent folks can have maladaptive patterns or skills deficits just like neurotypical people can. I definitely recommend this training for everyone who works with autistic folks. (Hint: That's anyone who works with people. Autistic people are likely somewhere between 1 and 5% of the population, and this includes an increasing number of adults who live independently and receive an initial diagnosis in adulthood.) The training covers a lot of information relevant for clinicians who "don't work with autistic people," but who should be providing neurodiversity affirmative care in our settings.
This one is a personal recommendation. My only affiliation with this training is being impressed with it and wanting to share so we can have more clinicians who are trained in neurodiversity-affirmative practices.