Hey Spacebar, welcome to the virtual group

I'm not in your area, but I've done some searching for "in person" support groups myself. Here's what I've tried or would recommend:
-Local churches often have "basic" support groups (like DivorceCare); but some larger churches often have more specific support groups, that wouldn't necessarily require you to be of the same faith. I actually found a group through a local Baptist church (I'm not Baptist) for people who have LGBTQ+ family members.
-Some churches in our area collaborate with a local family counseling practice to offer free parenting classes. So, you could again ask at a church, or flip through the phone book (if that's still a thing) or search online for a bigger counseling practice, then give them a call and just ask if they have a group. Or, if they know of a group in town that they could point you to.
-Check out community colleges & universities that have any kind of counseling, counseling psychology, child development, conflict resolution, etc, programs. Call the department's main phone # and even if they don't offer a group, I bet they'd be able to point you to some ideas. If they do offer a group, it might be low cost or free (often so that the students can get experience).
-I wanted a very specific sort of group and called a counseling practice here; they didn't have it, but recommended I try psychologytoday.com, which has a pretty detailed search feature. Worth a shot.
-Poke around on the "Son/Daughter with BPD" board here on the site -- a lot of the parents there talk about something called "Family Connections". I don't know much about it but it sounds like a support group if a family member has BPD/mental illness? Hopefully some members will chime in here; but if not, don't hesitate to post on the S/D board and also search online for "Family Connections group".
Tough stuff Spacebar... we're here for you, too, in addition to the group I hope you find.