I don't know about your neck of the woods, but in AZ there are almost no squares left in the junkyards. I don't seem many left on the road either, so I don't know where they went. Maybe they all went to Barrett Jackson.
The A/C shops have a lot of sources that we DIY guys to not have access to, so you might stop by one of your local shops and have them look at it. You might try to email them a photo, but my experience is that they usually don't respond to emails.