The first time I shopped at Rainy Days and Wooly Dogs, I just opened up their Etsy shop, found yarn I adored, and bought it. Now it's not quite so easy. Etsy stalking is involved. If you don't buy the yarn in less than a minute, you probably won't get it. (They have an update coming this Wednesday at 10amPDT, just sayin.)
I think I also might have been lucky enough to get one of the last custom orders. I know that right now, they're so busy preparing for Sock Summit, that no custom orders are happening for some time. A couple months ago, I bought some fingering weight Disco Dollies. I really wanted it in worsted weight, and now, lookee, I've got some! I think I'll cast on tonight.
And if that weren't exciting enough, there's also Barbie's Dark Side, all soft and yummy and pettable and oooooooh in Cashmere/Merino with a little nylon thrown in for strength. OHMYGOTH!