re: greater seattle area grocery question (please boost)
@Verdigris It looks like Yakima Fruit Market is still open! (https://yakimafruitmarket.com/?fbclid=IwAR1M1Sg0UFGz2Mx4rpFdQuJRwU8NuAlw24CCH0ehQ0je1jU6T7bPqenoT_0) I have no idea how they do for heirloom apples, but i always had good luck finding interesting produce up there. They might at least have someone on staff who can tell you where to go, might be worth a call!
I would also *highly* recommend hitting up the farmer's market in U District/Fremont/Ballard if it's still running and chatting up some of the sellers there. They were always *really* happy to talk shop with me and seem very likely to know where to go.
re: greater seattle area grocery question (please boost)
@zebratron2084 @Verdigris
Seconded, those sound like good places to start.