Why won't NBC release the SNL series from the 1990s?

I've been trying to find the Cats Sagan Global Warming Christmas Special sketch from the 1090s but there's no way to buy or watch a lot of sketches from the 1990s. They only release the crappy stuff from the later years. Why doesn't NBC want to release these classic sketches?! Why don't they want... show more I've been trying to find the Cats Sagan Global Warming Christmas Special sketch from the 1090s but there's no way to buy or watch a lot of sketches from the 1990s. They only release the crappy stuff from the later years.

Why doesn't NBC want to release these classic sketches?! Why don't they want to sell them on Amazon like they do the sketches from the 1979s?
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