The W minted quarters were mixed in with other quarters struck for circulation that are distributed to the various Federal Reserve Banks. They're not included in any sets, rolls, bags, etc. that you can purchase from the US Mint.
I believe so far, the first four (of five) 2020-W quarters have been released. Couple folks here on the forums have been lucky enough to find a few.
I picked up 10 rolls of quarters from my bank just yesterday and found this in the second roll. They are out there.