I’d say yes they are tougher to find if not impossible locally. I live in rural centra Louisiana and there’s a whole lotta nothing out here. My 4pd swap setup, I bought from a shop in AZ.. my 8 3/4 axle housing I drove 8hrs round trip to pick up. Stuff that’s kinda specific are tough. A center section for said axle.. you can buy online from a lot of places.. a pair of OE buckets from an A-body? No chance.. the ones you find online that need a full resto are super expensive. It’s why I put some TMI buckets in mine. The 340 long block I bought for my Dart, it was 6hrs away in Texas..
Overall however, the one of the good sides of the internet, it’s allowed me to find most everything I’ve set out to find.. not to mention the knowledge I’ve gained from reading about other people’s problems, progress, and success stories.
I can remember as a teen, the internet was pretty young as well, and all that was really out there was late 60s B body parts and E body parts… since those were the only ones people were really restoring.. the super bees, chargers, Cudas, challengers, roadrunners, etc…
If there is any stash of Mopar cars and parts in my state, it’s very hush hush