News AMD 5600X in stock at AMD $299 *Already sold out :(

The stock issue can be a few things
  1. Not producing many
  2. high demand
  3. both
This makes me think option 2. There are a fair number of them, they just are flying off of shelves.

I think 3, except 1 is more correctly "Not producing as much as they wish they could".

In separate but related news: is Intel's new CEO shaking things up or what. Intel seems to be genuinely going for the value-leader market position now: