Rockauto has great prices.
Trucks
https://www.rockauto.com/en/catalog/chevrolet,1984,k30+pickup,6.2l+379cid+v8+diesel,1053021,brake+&+wheel+hub
Blazer
https://www.rockauto.com/en/catalog/chevrolet,1984,k5+blazer,6.2l+379cid+v8+diesel,1050589,brake+&+wheel+hub