I remember Nibbles n' Bytes in Tacoma. I was going there once and told someone, and they asked what kind of dog I was getting.
Remember Zipperware? They held on the longest AFAIK.
How about Omni International? Southcenter had 5 stores:
Techstar, Software Centre, Software Pipeline, rental store (can't remember name) and one more I can't remember.
Familiy Computers in Factoria was great. They had Digiview setups you could rent by the hour.
One store at Thrashers corner in N Seattle held on for a real long time. Can't quite remember the name.
I think the first Amiga dealer in the PNW was in Kent! I can't remember thier name either just now. They were out of Amiga due to the 1.1 fiasco very early on.
I also went to die-hard Atari dealers Butler's Computer and Allen Sound, both on Hwy 99 in Federal Way.
