Buying quality parts becoming impossible.

I've got alot of bad quality parts lately, mostly gaskets and seals, I believe some are dry rotted from a long shelf life, probably because there's not as much of a call for it nowadays, I've got 2 Carter fuel pumps that didn't last a week, probably been on a shelf for years and was new but old, felpro gasket kits with dry rotted main seals, good quality stuff I just believe some of it has passed its shelf life nowadays .