Opps...does it have to be Cascade? I just nominate one of my favorite yarns made by Lang. After I did it I realized that all the other nominations were Cascade.....
I too would love to massdrop yarn. Knitting is such a big community and for one sweater it can take 5-6 skeins. We don't tend to buy one at a time. I came to massdrop looking for yarn.
A knitting group would be great, but you might get a broader base if it was presented as yarn/fiber. Have you checked out what's available from A Verb For Keeping Warm in Oakland, CA?
Natural fiber yarns, please. I can't imagine taking so many hours to make something and ending up with a plastic piece of garbage made from acrylic, nylon, polyamide, etc. Not to mention all the microplastics it will leech into the environment for the rest of known existence.
OH! And it would be awesome to get KnitIQ blocks! From what I've read, they're the ones best for interchanging into whatever shape is needed. Also, blocking wires and good stainless round-head push pins!