Dylan,
I'm sure you must have visited Richard Caryl at Cascade Outfitters in Omak. His shop is a bit on the high tech side-most are-but he's a real good guy who was learning to build self bows at the Traditional Bowhunters of Washington's WAJAM in Cashmere in July of this year. I saw him again at the jamboree in Packwood in August, and I'm certain he was shooting a traditional bow there.
The TBW is a great state organization to follow. Please join and attend their events. I am part of a new club in North Central Washington: the Wenatchi River Traditional Archers. We are a small group right now, but beginning to know we have a place. I plan a post on the TBW forum at the bottom of the main page about our group. To answer your question, I have not found a "good" traditional shops east of the mountains ...although there certainly may be some. I usually purchase supplies from the better mail order dealers, and buy 100 at a time, so I can distribute smaller quantities to local trad archers when they need them.
We would welcome you to join our club. We need enthusiastic new traditional archers. I will be in Omak for business in the next several weeks, so PM your phone number and email address, and maybe we can get together for a bit.
Tom Baldwin