Are square body Chevys/GMCs getting more popular?

[Nodnarb76]

When I bought my 87 Suburban back in 2013, I could look around and find plenty of Square bodies. Now Seems they are getting harder to find. Also recently seems like parts are getting harder to find. LMC truck has been out of stock on their premium chrome rear bumpers, this morning they had them back in stock, by this afternoon they were sold out again. Also noticed on Rockauto.com, I couldn't find stainless steel door mirrors for a long time on that site.
Are parts starting to dry up and getting harder to find? Are people buying these now and fixing them up more than they used to?