>>21412408internet mostly (sweet marias). and sams club or costco occasionally sells unroasted beans for some reason.
I'm sipping some cold brew right now, from beans I roasted last week. It's pretty good. I like really light roasts that are sour and fruity, so that is one advantage to doing the process yourself.
And damn, I finally looked up the thing in OP's picture and it's fucking $1500. Definitely don't get that to start.